The term "chat" has multiple meanings, depending on context.
1) In a general sense, chat refers to casual conversation between two or more people. It can be done in person or through various digital platforms such as messaging apps, video conferencing software, and online forums.
2) Chat may also refer to a specific type of communication tool that allows users to exchange text messages with each other in real-time. This is commonly used on social media websites, instant messaging services, and some mobile applications.