Many LLMs can input and output not just text but images, videos and other files such as spreadsheets. You can often add files to your prompt by clicking on the plus sign(+) or the paperclip. Those files are part of your input to the system. You can ask the LLM to analyse them etc.
You might have a file that you want AI to work on e.g. analysing the data in a spreadsheet, or improving something you have written.
Or maybe you do not have time to read a document, or a webpage, or to watch a YouTube video and you just want to know the key points.
Because AI is unreliable, I sometimes ask one AI model to critique what has been produced by another model.
Models that can work on other files will generally have a little plus sign (+) of a paperclip close to the prompt area.
Upload a picture to xyz and ask it to describe it.
Upload a spreadsheet to xyz and ask questions about it
Is there a tool that will produce graphs?