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CRUD
CRUD stands for Create, Read, Update, and Delete, representing the four basic operations for persistent storage that nearly every data-driven application implements. In web development, CRUD operations map to HTTP methods (POST for Create, GET for Read, PUT/PATCH for Update, DELETE for Delete) and SQL statements (INSERT, SELECT, UPDATE, DELETE). Understanding CRUD is fundamental to building any application that stores data.
SQL Injection
SQL injection is a code injection attack where malicious SQL statements are inserted into input fields, potentially allowing attackers to read, modify, or delete database data, bypass authentication, or even execute system commands. It exploits applications that concatenate user input directly into SQL queries instead of using parameterized queries or prepared statements.