Because the more people you know, the more you find that people get along and communicate with each other. Sometimes it is not because of the attraction of each other's personalities, but because it is necessary. If two people are in contact with each other at work, it is natural to do basic polite communication and say hello when they meet, but it is only a nodding acquaintance. Usually there is no connection at all, and it is even more difficult to be intimate friends. In the workplace, it is impossible to say that some people will become competitors one day, so it is difficult to make real friends.