post interview ettiquette

I went to a college today for an interview. The interviewer was a senior at the college. He gave me his business card, which has his email address. Should I email him to say thank you? How soon should I do it?
Thanks for the advice!

yes it is a good idea to follow up with a thank you for the interview and it is good to do as soon as possible but within a week seems appropriate. Good luck!

I would send a thank you email in the next day or so while your meeting is fresh in his mind.

Yes, definitely send him a thank you note soon. I always send it the night of the interview (like 5 hours post-interview) so that way the fact that I sent a thank you note gets included in the report they write on the interview.
I would also personalize the note- say something specific you enjoyed about the conversation, don’t just do a generic thank you.