Two-factor authentication (2FA) is a technology used to protect computer systems from unauthorized access. It requires two separate pieces of information to verify a user’s identity before granting access. The first factor is typically something the user knows, such as a password or PIN. The second factor is usually something the user has, such as a physical token or a mobile device. By requiring two pieces of information, 2FA makes it much more difficult for an unauthorized user to gain access to a system. It is commonly used in the computer industry to protect sensitive data and accounts from hackers and other malicious actors. 2FA is also used to protect online banking accounts, email accounts, and other sensitive information.