What is sql injection

Question

I heard this term when a site of iit was used on it and cracked the site

Answer 1

SQL injection is a code injection technique that might destroy your database.

SQL injection is one of the most common web hacking techniques.

SQL injection is the placement of malicious code in SQL statements, via web page input.

further more
reference https://www.w3schools.com/sql/sql_injection.asp