When people say a post or comment is by a bot what do they mean?

[Baublingalong]

I'm assuming R2D2 isn't sat tapping away on a computer somewhere, so what is meant by bots on forums?

It will be an AI tool that will be answering from a selection of learnt responses sea

Didn't mean to type sea ☺️

https://www.cloudflare.com/en-gb/learning/bots/what-is-a-spambot/

Read up OP.