With Google Chat, you can send and receive instant messages with anyone using Google Chat, Hangouts or certain third-party apps.
Gmail and other Google products with instant messaging use Hangouts as the default messaging app. You can change your default messaging app in Gmail to Google Chat.
You can save and search your Google Chat messaging history through Gmail. Learn more about chat history.
Voice & Video
For group conversations, emoji, photos and more, try using Hangouts. Learn more about how to get started with Hangouts.