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Zod is a TypeScript validation concept that validates runtime data with schemas that TypeScript can understand.
Zod matters because Zod is common for form, API, config, and AI-output validation. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of Zod as a rule for how information is shaped and checked. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it when data crosses forms, APIs, databases, or AI outputs. In practice, name the owner, input, output, failure mode, and proof before relying on Zod.