There are a few different keywords you can google for when building a chat feature in app. These keywords include "chat API", "chat SDK", and "chat platform". Each of these keywords will bring up different results that can help you with building a chat feature in app.
For example, if you google "chat API", you will see results for different chat APIs that you can use to build a chat feature in your app. Some of the top results include the SendBird API, the Layer API, and the Nexmo API.
If you google "chat SDK", you will see results for different chat SDKs that you can use to build a chat feature in your app. Some of the top results include the SendBird SDK, the Layer SDK, and the Nexmo SDK.
Finally, if you google "chat platform", you will see results for different chat platforms that you can use to build a chat feature in your app. Some of the top results include the SendBird platform, the Layer platform, and the Nexmo platform.