Milsim is like playing pretend games but in a very serious way with rules and objectives. It's like when you play cops and robbers or army but it's meant for adults and it's much more serious.
In milsim, people dress up like real soldiers or other military personnel and they use equipment that actual soldiers would use. They also learn tactics and strategies for completing missions and objectives.
During milsim games, teams work together to complete certain tasks like capturing a flag or rescuing hostages. There are safety rules that must be followed to make sure no one gets hurt, and sometimes there are referees to make sure everyone is playing by the rules.
Milsim is a fun way for people to pretend to be military personnel and practice important skills like teamwork, communication, and leadership.