google chat formally known as Google Hangouts is a messaging application through gmail

You can use Chat to send messages, make voice and video calls, and share photos.

Chats are synced automatically across devices, so you can start a chat on your computer and continue on another device, like your phone.

What you can do with Chats

Send messages: You can start a Chat with only one person or have a group chat with several people.
Make video calls: You can have face-to-face video calls with up to 100 other people.
Make phone calls on Wi-Fi or data: Almost all calls you make to the U.S. and Canada are free from all countries where Chats calling is available. A few U.S. and Canadian destinations will cost 1 cent per minute (USD), or the listed rate for your local currency. Calling isn't available to all locations.
Send text messages: You can send text messages using Chats with your Google Voice or Google Fi phone number. On Android devices, you can send texts using chats with your carrier number.
Share photos, videos, locations, and stickers: You can share photos, stickers, and emoji in conversations. On mobile devices, you can also share your location with other people.

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