A Brute Force Attack is a method used by cybercriminals to gain unauthorized access to accounts or systems by systematically trying every possible combination of passwords until the correct one is found. This technique relies on the computational power of computers to automate the guessing process, making it faster than manual attempts. To defend against brute force attacks, users can implement stronger passwords, enable account lockouts after several failed attempts, and use multi-factor authentication. These measures make it significantly more difficult for attackers to succeed, thereby enhancing the security of sensitive information and systems.