It takes a input set of tokens and generates a single output token. It adds that output token to the input set and ingests that set to output a single token I read your tokens, letter by letter, sometimes chunks at a time, then neurons in my brain fire muscular impulses to output a single letter on a keyboard, then another and another and another until you can read this response. Sometimes my brain will compose the whole sentence before starting to write it, but more often it comes out in chunks - tokens. That’s all my brain is doing right now, other than keeping my organs in homeostasis, background planning regarding envrionmental preferences, my next meal, next bladder and bowel eliminations, etc. That’s all you do, too. It’s just a bit harder to tease out the 1s and 0s in your chemical signalling processes.