What does "var" mean in programming?

var is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.

Definition

An older JavaScript keyword for declaring variables. Unlike let and const, var is function-scoped (not block-scoped) and is hoisted to the top of its function. Prefer const or let in modern code.

Example

"// Avoid: var x = 5; // function-scoped, can cause bugs"

Related terms

let
const
variable
scope

Ready to practice your English at work?

Lingua-e has interactive exercises built around real developer conversations: standups, code reviews, retrospectives, and more. Practice until it comes naturally.

Try Lingua-e for free