Every human being needs to socialize, that is why friendship is something very natural for all of us. Two friends can have romantic relationships, professional relationships, emotional relationships, social relationships, etc. Also, there are always very special ties between two roommates, two soul mates or two pan pals. Any of such relationships we can call “friendship”. According to several factors (including nature of the relationships, maturity of friends, etc.), it is possible to classify different types of friendships.