Informational Social Influence
When you make decisions about how to behave, there are many sources of information available to help you make these decisions. Sometimes you may need to seek out experts, conform to the way others or a group are behaving, or look to some other source of information. One other way is to use informational social influence; you look to the behaviours of others who are also in the same or similar situation to see how they behave. Then, you can follow their lead.
For example, you travel to another planet, where some nice aliens offer to show you around. They decide to take you to one of their sporting events that is unlike anything you have ever seen. The problem is that, since you have no idea what the game is about, you don’t know what is good, bad, when to cheer, boo, or how to act in general. What can you do? You can simply watch how others are behaving, what they react to, what is going on when they cheer, when they boo, etc. In this way, you seek information from your social surroundings, which influence your behaviour.