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In computer science, SQL injection is a code injection technique used to attack data-driven applications. This attack occurs when malicious SQL statements are inserted into an entry field for execution, exploiting vulnerabilities in how an application handles user-provided data. SQL injection primarily exploits instances where user input is not properly filtered or validated, or when it is included directly in SQL queries without sufficient control. As a result, attackers can interfere with database commands and perform unauthorized actions. Through these attacks, it is possible to spoof identities, modify or delete existing data, expose sensitive information, or even gain full administrative control over the database. Although typically associated with web applications, SQL injection can affect any system that uses SQL databases and, in some cases, even other systems like NoSQL databases. According to the Open Web Application Security Project (OWASP), this vulnerability occurs when applications construct database queries using unverified input. To prevent these attacks, techniques such as the use of prepared statements, stored procedures, and strict input validation are recommended. In this article, we will demonstrate the most common forms of this attack, illustrated with concrete examples from practice.