: The most common type, where the attacker uses the same channel for the attack and results, such as UNION-based attacks .

: Observing the application's response (e.g., Boolean-based or time-based) to infer data.

To develop a comprehensive guide based on the concepts typically found in tutorials like "HOW TO MAKE HQ COMBO USING SQLi DUMPER v 10.1.mp4," it is essential to understand the technical process of SQL injection (SQLi) and the ethical boundaries of cybersecurity research.