A chat is an online conversation with one or more people. Whether one-on-one or in a group, chats are usually private and text-based, although they may incorporate GIFS, photos, and even audio recordings. Common chat platforms include WhatsApp and Facebook Messenger.
“Chat” can also be used to mean a moderated public conversation on social media, organized around a hashtag. Twitter chats, like the monthly #HootChat, are a prime example.