A strong password in cybersecurity is characterized by its complexity and unpredictability, which significantly enhances security against unauthorized access. Effective passwords typically include a mix of uppercase and lowercase letters, numbers, and special characters, making them difficult to guess or crack through brute force methods. Additionally, a strong password should be at least 12 characters long and not contain easily identifiable information, such as names or birthdays. Regularly updating passwords and using unique passwords for different accounts further enhances overall cybersecurity.