# Analogy > A comparison that explains or argues something by showing it works like something more familiar: the heart as a pump, electricity as water in pipes. Where a simile describes a likeness, an analogy carries a whole structure across. Also known as analogies, analogical reasoning ## In practice An analogy explains something unfamiliar by showing that it works like something the audience already knows. "The immune system is an army" gives you a whole structure at once: soldiers, scouts, a memory of past enemies. That transfer of structure is what separates analogy from a simple simile, which only says that two things share a quality. In stories, analogies are how characters teach, persuade and reveal themselves. A mentor explains a hard truth through something from the student's world; a lawyer wins a jury with a comparison they can picture; a character's choice of analogy shows what they know and care about. Screenwriters also live by analogy before a word is written: pitches compare a new film to known ones, as in the famous description of Alien as "Jaws in space." The common mistakes are analogies that need more explaining than the idea they explain, analogies that break at the exact point that matters, and dialogue that stops a scene so a character can deliver one. The best analogies come from the speaker's world and arrive at the moment the listener needs them. ## An analogy that wins an argument **A coach explains why the team lost** ``` INT. HIGH SCHOOL LOCKER ROOM - NIGHT Wet towels, a silent team. COACH DELGADO (50s) stands in front of a whiteboard he hasn't written on. His star forward, ELI (17), won't look up. ELI I scored twenty-eight. What else was I supposed to do? COACH DELGADO A band with the best drummer in the state still sounds terrible if the drummer won't listen to anybody else. You played your solo all night, Eli. We needed a song. Eli finally looks up. A couple of the other players nod. ``` The coach could have said "you need to pass more." The analogy does more: it maps Eli's talent onto the drummer's, the team onto the band and the loss onto a bad song, so the criticism comes with a picture of what success sounds like. It also works for this listener, a teenager who knows what a band sounds like, and it lands without sounding like a lecture. ## What an analogy is An analogy is a comparison between two things that shows how they work alike, usually to explain or argue something about the less familiar one. "A heart is like a pump" is an analogy when it goes on to explain that both push fluid out and draw it back in. The word comes from the Greek analogia, meaning proportion. The classic form is a proportion: "A is to B as C is to D," as in "glove is to hand as sock is to foot." Word analogies like this were long a staple of school tests, because they check whether a reader can see the relationship rather than just the things. In writing, the same logic usually runs over a sentence or a paragraph rather than in a formula. An analogy can use the words of a simile ("like," "as") or of a metaphor ("is"), so what makes it an analogy is its purpose. A simile or metaphor describes; an analogy explains or argues by carrying a structure from one thing to another. ## Types of analogy Explanatory analogies make a new idea clear by mapping it onto a familiar one. Teachers use them constantly: electricity as water in pipes (voltage as pressure, current as flow), the early model of the atom as a small solar system, a cell as a factory with its own power plant and shipping department. Each one is a simplification, and a good teacher says where it stops being true. Arguments from analogy try to prove something by comparison. In 1802, William Paley argued that a watch found on a heath implies a watchmaker, and so the world's complex design implies a designer. Arguments like this are only as strong as the likeness they rest on, which is why the critics of Paley's watchmaker analogy have attacked the comparison itself. Word analogies are the test-style form ("hot is to cold as up is to down"), and they come in recognizable patterns: opposites, part to whole, tool to user, cause to effect. Extended analogies run through a whole work, such as Plato's allegory of the cave, which compares human understanding to prisoners who mistake shadows on a wall for the real world. ## Analogy examples in literature and film Film dialogue is full of analogies that characters use to explain themselves. In Shrek, the ogre tells Donkey that "ogres are like onions" because both have layers, and Donkey's attempts to improve the analogy (cake? parfait?) turn it into a running joke while still making the point. In Forrest Gump, "Life is like a box of chocolates" is a simile that works as an analogy: you never know what you're going to get. Literature uses analogy to make large ideas human-sized. In Romeo and Juliet, Juliet argues that a name is only a label ("that which we call a rose / By any other word would smell as sweet"), an analogy that carries her whole case against the feud. In Plato's Republic, the cave turns a theory of knowledge into a scene anyone can picture. Pitches and loglines are analogies too. "It's Die Hard on a bus" was a widely used shorthand for Speed, and "Jaws in space" for Alien. A comparison like this tells a producer the genre, the tone and the engine of the story in one breath, which is why writers spend so long choosing the right ones. ## Analogy vs. metaphor and simile All three compare unlike things. A simile states a resemblance with "like" or "as" ("her voice was like velvet"). A metaphor says one thing is another ("her voice was velvet"). An analogy uses a comparison to explain a relationship or a process ("her voice did for the song what velvet does for a room: it softened every edge"). The quick test is what the comparison is for. If it adds an image or a feeling, it is a simile or a metaphor. If it explains how something works or argues a point, it is an analogy. A single sentence can be both: "Life is like a box of chocolates" is a simile in form and an analogy in use. Analogies usually run longer, because they map several parts of one thing onto another. That is their strength and their risk: the more parts you map, the more chances the comparison has to break. ## How to write a good analogy Start with the listener. An analogy only works if the familiar half is truly familiar to the person hearing it, so a coach talks to a teenager about bands, and a mechanic explains a marriage in engines. In dialogue, the choice of analogy is characterization: it shows what the speaker knows and how well they know their listener. Map only what matters, and check where it breaks. Every analogy fails somewhere; the question is whether it fails at the point you are trying to make. If a listener could turn the comparison against you ("but water doesn't jump between wires"), choose a different one or say plainly where it stops. Keep it quick in a scene. A character who delivers a long analogy stops the drama unless the analogy is the drama, as in a closing argument or a confession. Often the best version is one sentence, followed by the other character's reaction, which shows whether it landed. ## Official sources & context Sources reviewed Oct 29, 2026 - [Merriam-Webster — Analogy](https://www.merriam-webster.com/dictionary/analogy) [Find exposition that explains instead of dramatizing with Exposition Audit](https://www.inkwell.software/skills/exposition-audit) ## Common questions ### What is an analogy in simple terms? An analogy explains one thing by comparing it to something that works the same way. Saying "the heart is like a pump" and explaining how both push and pull fluid helps someone understand the heart through something they already know. ### What are some examples of analogies? Common ones include electricity as water flowing through pipes, the brain as a computer and a cell as a factory. In film, Shrek's "ogres are like onions" (they both have layers) is an analogy, and so are word puzzles such as "glove is to hand as sock is to foot." ### What is the difference between an analogy and a metaphor? A metaphor says one thing is another to create an image or feeling ("time is a thief"). An analogy uses a comparison to explain how something works or to argue a point, often over several sentences. Many analogies are built out of a metaphor or simile. ### Is an analogy a simile? Not always. A simile uses "like" or "as" to describe a resemblance. An analogy can use "like" or "as" too, but its job is to explain or argue. "Life is like a box of chocolates" is a simile that also works as an analogy, because it explains something about life. ### What is a false analogy? A false analogy, also called a faulty or weak analogy, is a logical fallacy: it assumes that because two things are alike in one way, they must be alike in others. "Employees are like nails: you have to hit them on the head to make them work" rests on a likeness that does not hold. ### How do you solve analogy questions? Name the relationship in the first pair as a sentence ("a glove covers a hand"), then find the answer pair that fits the same sentence ("a sock covers a foot"). Common relationships are opposites, part to whole, tool to user, cause to effect and type to example. ### Why do writers use analogies? Analogies make new or abstract ideas easier to grasp, make arguments more persuasive and memorable, and in fiction show how a character thinks. The analogy a character reaches for reveals their world, and whether it lands shows their relationship with the listener. ## Related terms - [Simile](https://www.inkwell.software/glossary/simile): A figure of speech that compares two unlike things using "like" or "as": "brave as a lion," "a smile like a switched-on light." The comparison is stated openly, which is what separates a simile from a metaphor. - [Metaphor](https://www.inkwell.software/glossary/metaphor): A figure of speech that describes one thing as if it were another, without "like" or "as": "time is a thief." The comparison carries a feeling or an idea the literal words could not, and a reader understands it in an instant. - [Pitch](https://www.inkwell.software/glossary/pitch): A concise selling of a project — spoken or written — that names the hook, characters, conflict, and why this story now, without requiring the listener to read the whole script first. - [Exposition](https://www.inkwell.software/glossary/exposition): Story information the audience needs — who people are, what happened before, how the world works. Strong drafts dramatize it; weak drafts dump it in speeches or captions. --- Canonical page: