Gemini will be integrated to Bard.

Gemini is NOT a chatbot like Grok, it is a model like GPT-3, GPT-4.

Google's chatbot is called Bard which will be integrated with Gemini Ultra, Pro, Nano which are the three new model from Google.

as a start, Bard is now running on a new model called Gemini Pro.

https://twitter.com/JackK/status/1732415006564843731

TLDR:
Bard is Google's tool for competing with Grok and ChatGPT.