What is what does mutual friends mean?

Mutual friends mean people who are friends with both individuals in a given social network. For example, if person A and person B are friends and person B is also friends with person C, then person B is a mutual friend of person A and person C. Mutual friends often play a role in connecting people and providing a shared social context within larger social networks. In online social networks like Facebook, mutual friends can be used to suggest potential new friends or to validate the trustworthiness of new contacts.