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Create, Read, Update, Delete: the four basic operations most apps perform on data.
A todo app, CRM, user profile, or admin dashboard usually starts with CRUD. It is the simplest way to reason about what a feature needs from a database and API.
Plainly
Think of CRUD as a labeled box where an app keeps important things. Create, Read, Update, Delete: the four basic operations most apps perform on data.
In practice
Use it when a feature reads, writes, migrates, validates, or audits stored information. In practice, define the owner, input, output, and failure mode before you rely on it.