Chat means to talk casually with someone about everyday things, like what happened at recess or which movie you want to see. When you chat with a friend, you're not having a serious discussion or formal conversation. You're just enjoying relaxed back-and-forth talk. You might chat about your weekend plans, a funny thing your dog did, or a new book you're reading.

The word suggests friendly, easygoing conversation without much pressure or purpose beyond connecting with someone. A teacher might chat with students before class starts, or neighbors might chat over the fence about the weather. People chat at lunch tables, in hallways, or while waiting in line.

Online, chat has also become a noun describing written conversations. You might send messages in a group chat with your friends or use a chat room to talk to others who share your interests. Video game players often chat with teammates using headsets. Whether speaking or typing, chatting is about connection and conversation, not formal communication.