Gemini AI allows us to build apps using 3 types of prompts. Further, we can customize a chat model to answer questions we need. We can upload a dataset (questions and answers) to it and it will answer based on those plus it's ai capabilities.

This kind of app can send a simple prompt with or without image to the Gemini ai and get an answer. As an example, we can send an image to Gemini and ask for a description about it.

You can check the "Poem" page of this website to get an idea about this kind of app. It will generate a poem when you give a topic.

You can check the "Chat" page of this website to get an idea about this kind of app. I assigned a "Train Lover" role to it. So, AI will reply to you about any questions about trains. It will remind you he is an expert at trains and does not know other stuff if you ask anything else.