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What does "validation" mean in programming?
validation 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
The process of checking that input data meets the expected format, type, and constraints before processing it. Validation should happen at the system boundary (API layer) to reject bad data early.
Example
"Add validation to ensure the email field is a valid address before saving to the database."
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