The first type of those people are acquaintances.This means that you basically only know their names. Sometimes you might not even remember them. Usually, you meet these people in school, at work, or on the bus, or anywhere else you might be. These acquaintances are nice people to talk to, but there is never an effort to do anything more than that.
The second type is colleagues. Colleagues are people that you make a special effort to talk to at work or in different places after work; You would talk about your work, but also talk about other things like family, favorite things, jokes, etc.
The last type is best friends. These friends are the ones that are practically a part of your family. Your best friend is the one you go to when you are having problems and need advice. Usually you have the best times when you are with them. Best friends share common interests, and do many things together. They are very important for us, because we share with them some things which are secret things that are not known by anybody. When we fall into bad condition, they cheer us up. They support us.