Create, Read, Update, Delete - the four basic operations for managing data in databases. Like the essential actions you can perform on any information: add, view, change, and remove.
Web applications typically provide CRUD functionality, allowing users to create posts, read them, update content, and delete items.
CRUD is an application/data-access pattern (Create, Read, Update, Delete), not a specific cloud service. You implement CRUD using databases (SQL/NoSQL), storage, and APIs on any cloud provider.