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What does "layer" mean in programming?
layer 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
A logical separation of concerns in a system. Common layers in web applications include the presentation layer (UI), business logic layer, and data layer. Layers communicate through defined interfaces.
Example
"Keep database access in the data layer, not scattered across the business logic."
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