Peer pressure is influence on your behavior from a group that you interact with socially or professionally. It can be good or bad depending on what action is taken, what consequences it brings and whether or not you want to do it.
Adults also have peer pressure that usually comes from a group of people that share interests or professions.
Here are examples of peer pressure for adults:
These various examples of peer pressure show how behavior can be changed in many ways based on those around us.