Four everyday actions
A contacts app can save a new contact in a database (create), show their details (read), change their phone number (update), and remove the contact (delete). Developers call these four actions CRUD.
A “CRUD interface” is a screen for adding, viewing, editing, and removing records.
Rules still matter
Not everyone should be allowed to perform every action, and some information should be archived rather than erased. A task may also involve several steps: refunding an order could mean returning payment and notifying the customer.