Common interest friends are people with whom you share hobbies, interests, or passions. You can go on outings or trips with common interest friends. The people who you interact with on a weekly basis at your local chess club are common interest friends. This is a unique classification of friendship because it doesn't connote a deep emotional connection. You may not see these friends very often and they may know little of you outside of your shared interest. Common interest friends are not necessarily going to be there for you in a time of great need. Some people refer to common interest friends as "friendly acquaintances" to emphasize the amicable but superficial nature of the relationship.