Log in: meaning, definitions and examples

To enter your username and password to get into a system or website. Typically used for general online services and computers.

• Please log in to your account to view your messages
• You'll need to log in with your email and password

To enter your details to access a system or service. Used interchangeably with 'log in' but can also be used in more informal or physical contexts.

• Sign in at the reception desk before entering the office
• You must sign in to your account to proceed

To gain entry or retrieve information from a system or location. Used in broader contexts, not limited to just entering a system.

• You need a keycard to access the building
• Only authorized users can access the confidential files

To verify the identity of a user before granting access. Usually used in more technical or formal contexts, often involving security measures.

• The system will authenticate your credentials before allowing access
• Multi-factor authentication is required to authenticate user identity