A liaison is a person who acts as a connection or communicator between two groups that need to work together. Think of a liaison as a bridge: when the student council needs to share ideas with teachers, they might choose a liaison to carry messages back and forth and make sure both sides understand each other.

Companies often have liaisons between different departments. A hospital might have a patient liaison who helps families communicate with doctors and nurses. In the military, a liaison officer connects different units or even different countries' forces so they can coordinate their efforts.

The word can also describe the connection itself, not just the person. When two organizations establish a liaison, they're setting up a way to communicate and work together smoothly. You might hear someone say they'll “liaise with” another group, meaning they'll communicate and coordinate with them.

A good liaison needs to understand both sides, communicate clearly, and remember what each group needs. They help prevent misunderstandings and make cooperation possible. Without liaisons, large organizations would struggle because the left hand wouldn't know what the right hand was doing.