What is Salesforce snap ins?

Hello deepak,

Snap-Ins Chat
https://help.salesforce.com/articleView?id=snapins_chat_setup.htm&type=5
You can add Snap-ins Chat to the website , customers can get answers to their questions by chatting with an agent while browsing your site.
Snap-ins Chat uses Live Agent, but with a simpler setup, to power your chats.