CRUD
In plain terms
The four basic data operations: Create, Read, Update, Delete.
Going deeper
CRUD describes the fundamental actions on persistent data that most applications perform. It maps neatly to HTTP verbs and database operations.
Under the hood
Maps to POST/GET/PUT/DELETE and SQL INSERT/SELECT/UPDATE/DELETE; the backbone of data-driven apps.
Examples
REST APIs, database apps, admin panels, form-based applications.
Think of it like...
Like the basic file-cabinet actions: add, look up, edit, and throw away records.