# Callback Function

A function passed to other code to be called later or during an operation.

## What is **Callback Function** in JavaScript?

**Callback Function** — A function passed to other code to be called later or during an operation.

```javascript
function greet(name) {
    return `Hello, ${name}`;
}

const names = ["Ada", "Lin"];
const greetings = names.map(greet);
```

Level: Apprentice · [More JavaScript terms at this level](https://www.ask-codey.com/glossary/subjects/javascript/apprentice)

Updated: September 27, 2026

Source: https://www.ask-codey.com/glossary/callback-function