Which security measure is effective in preventing unauthorized access to devices?

Using strong, unique passwords and enabling screen locks is a highly effective security measure in preventing unauthorized access to devices. Strong passwords are typically longer, include a mix of uppercase and lowercase letters, numbers, and special characters, which makes them significantly harder for attackers to guess or crack through brute force methods. Unique passwords for each device or service ensure that even if one password is compromised, other accounts remain secure.

Enabling screen locks adds an extra layer of security by requiring authentication to access the device after a certain period of inactivity or when it is locked manually. This measure helps to protect against unauthorized access in scenarios such as leaving the device unattended or if it is lost or stolen. Together, these practices create a robust defense against unauthorized access to sensitive information and personal data.