idiot is a term used to describe someone who is stupid or foolish.
In medical history, idiot was once used as a technical term for people with very severe intellectual disability.
The word "idiot" can also be used in these contexts:
1. As a playful insult between friends ("Don't be such an idiot!")
2. In internet slang ("That's so idiotic lol")
3. In pop culture references (like "Village Idiot" archetype)