Okay kiddo, so a street team is a group of people who help promote something like a band, a movie, or a product. Imagine you have your favorite toy and you want your friends to like it too, so you show it to them and tell them why it's so cool. That's kind of what a street team does but on a bigger scale.
Let's say a band is coming to town and they want everyone to know about their concert. The band might ask some fans to help spread the word by putting up posters around town, handing out flyers, or sharing posts on social media. Those fans would be part of the street team.
Being part of a street team can be fun because you get to help promote something you really like, and sometimes there are special perks like getting to meet the band or getting free stuff.
So, to sum it up, a street team is a group of people who help promote something cool by telling others about it and sharing it with the world!