What is when a guy puts his arm around your shoulder?

When a guy puts his arm around your shoulder, it typically indicates a desire to show affection or establish a closer connection. It may be a sign of protectiveness or a comforting gesture. It can also convey a sense of camaraderie or closeness in a platonic relationship. However, it's important to note that it can also be inappropriate or unwelcome, and it's always important to communicate your boundaries and comfort level in any situation.