SQL Injection is a cyberattack technique where hackers exploit vulnerabilities in a website’s database by inserting malicious SQL code into input fields, like login forms or search boxes. If the website doesn’t properly check or sanitize these inputs, the attacker’s code can trick the database into revealing sensitive information, modifying data, or even taking control of the system. This method is one of the most common and dangerous web security threats, often targeting websites that rely on user-supplied data. Preventing SQL Injection involves validating and sanitizing all user inputs and using secure coding practices.