The chat is a feature that will allow you to interact with your team members as well as your opponents in Classic games. Remember to be kind!
Teams are groups of users of up to 50 members; you will find them in the fifth icon on the bottom bar of the game.
Once you are part of a team, you will see its members sorted from highest to lowest in relation to their respective levels and connection statuses.
If you are part of a team, you will have the possibility to communicate with the other team members via chat. You can access the chat from the third tab on the top bar of the Teams menu.
On the other hand, you will also be able to chat with your Classic mode opponents from the Games section, located on the bottom options bar, in the icon of a list.
For more information on teams, we invite you to visit the article What are the teams?