difference between two words

Hello

What is the deep difference (meaning, semantic, origin, use) between this 2 words :

1. Другом

2. парнем


When should we use 1. or 2. ?

Thanks

Друг is a friend. This word normally has no direct relation to love affairs.

Парень is a guy, lad, fellow.
It also means boyfriend:
У неё есть парень? Does she have a boyfriend?
Кто твой парень? Who is your boyfriend?

Note, that "парень" also has more specific meaning as "young man".
Approximate numbers:
мальчик (boy) = 0 to 14 years
парень (guy) = 14 to 25-29 years
мужчина (man) = 25-30 to 60 years
старик (old man) = over 60
So, if we talk about age above 30 we should say "У неё есть мужчина? Does she have a man?".

ahh ok i got the meanings

Thanks