Hi Tammi,
Teams are to help promote your items ( so you have a better chance at selling them ) and team members will also help to promote yours while you promote theirs.
In teams, you look at the threads that are usually set up by your team Captain and/or leaders, an example of this can be from our teams thread, "Favorite Item From Shop Above" So that is actually a team game! What you do is you look at the shop of the person who posted last, pick a item, copy the link and favorite it, then you go back and post it in the group. Favorites can help bump you up when somebody searches for the type of item that you have which is why they're important.
It's also possible that a team member may want to buy an item they see!
Team members can also give constructive criticism and tell you how you can better your shop!
If you're team members promote their items somewhere else, it's possible they'll promote yours there too!
Teams are also where you can promote treasuries and use people to create treasuries - if you don't know what a treasury is you can look here :
https://www.etsy.com/help/article/82 -
Teams are a mini organization on Etsy, like a shop support group but they are here to help you excel with your shop!