What is mutual friend in facebook means?

A mutual friend on Facebook is someone who is connected to two or more people on the social networking site. It is a person who is a friend of both you and another user on Facebook. You can see the mutual friend's profile and the friends that you share in common. They serve as a connection between people who may not be directly linked on the platform. Mutual friends can help build bridges and facilitate new connections on Facebook, which can lead to expanding your network and strengthening relationships with existing friends.