It means 'everybody' or 'everyone'. http://endic.naver.com/search.nhn?&searchOption=all&query=%EC%97%AC%EB%9F%AC%EB%B6%84 You can just use a dictionary for things like that

Hello, My name is maris, which is really nice to get on this site, I took interest in you after reading your profile at (www.italki.com). ([email protected]) I believe age and distance has nothing to do with love, so just drop me an email through my private e-mail address ([email protected]), so that we can communicate better and I send you my images. Thank you. maris.

It means Everybody/Everyone.

You can say officially "Ladies and gentlemen" . or "Everybody" informally.