An underrepresented group is one that doesn't get enough attention or consideration. It's like being part of a team and not getting enough turns to play.
When we talk about something being underrepresented, it usually means that certain people, ideas, or things are missing from a situation, discussion, or event. For example, you might hear someone say, "Women are underrepresented in politics." This means there aren't as many women involved in making decisions for the country. Similarly, if a movie is criticized for not showing enough diverse characters, it's because some groups are underrepresented on screen. Sometimes we use this word to describe situations where people feel left out or marginalized.
To represent something as being lower or smaller than is the case.
Having less than adequate or sufficient representation
