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What does "constant" mean in programming?
constant 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 named value that cannot be changed after it is set. Constants are used for values that should never change, like configuration settings, magic numbers, or fixed limits.
Example
"Define the timeout as a constant so it is easy to change in one place."
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