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OWASP is a security or privacy concept that helps protect users, permissions, secrets, and systems from abuse.
OWASP matters because security failures usually come from trusting input, leaking secrets, weakening permissions, or skipping verification. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of OWASP as a lock, rule, or alarm for the app. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it when data, auth, payments, user-generated content, or external tools touch the system. In practice, name the owner, input, output, failure mode, and proof before relying on OWASP.