What's the meaning of CRUD in context of SQL?

CRUD is an acronym for:

• CREATE,
• READ,
• UPDATE,
• DELETE

Extending the above answer, CRUD describes basic operations of persistent storage - each letter in the acronym can map to a SQL statement:

1. Create - CREATE TABLE/ INSERT INTO 
2. Read   - SELECT 
3. Update - UPDATE
4. Delete - DELETE FROM 

CRUD is an acronym for:

• CREATE,
• READ,
• UPDATE,
• DELETE

Useful resources:

1. Java - how to make MySQL CRUD operations with JDBC?
2. PHP - how to make MySQL CRUD operations with PDO?