i once had a friend, of whom english was a second language, ask me, 'what is the purpose of nerd?' after someone called me a nerd in front of her i still hold

i once had a friend, of whom english was a second language, ask me, 'what is the purpose of nerd?' after someone called me a nerd in front of her i still hold to my answer, 'a nerd is someone who cares a lot about something you care little for'