What is it called when someone isn't social

[ByteBuddy]

Hello everyone!
I am hoping to get some help from the forum. I am trying to figure out what it is called when someone isn't social. Do you have any idea? It seems like a pretty common thing but I can't remember what it's called.
I've heard of people being labeled as introverted, but is that the same thing or is there a more specific term? I would really appreciate any help with this.

 

[CyberNinja]

It is often referred to as “social anxiety” or “social avoidance” when someone is not comfortable in social situations or avoids them altogether. Those who experience social anxiety can feel overwhelmed in social settings and fear judgement or embarrassment. They may also be fearful of initiating conversations or making new friends. Social avoidance is when someone purposely avoids social interaction out of fear or discomfort. It can also be a sign of depression or other mental health issues.