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Checking user or external data before trusting or storing it.
Input validation protects forms, APIs, databases, and model tools from malformed or malicious data. Validate at boundaries and return clear errors.
Plainly
Think of Input Validation as the lock and rules that keep people and data safe. Checking user or external data before trusting or storing it.
In practice
Use it when a workflow touches secrets, permissions, user data, payments, or untrusted input. In practice, define the owner, input, output, and failure mode before you rely on it.