mine are Symphonic and Melodic Death Metal
Metal is typically heavier, louder, usually with darker, and more aggressive lyrics (the exception being glam metal for the most part). Technically, metal is a genre of rock since it was born out of blues-rock but i always see them as different genres too, so yeah :P Rock is more popular, its easier for the masses to handle.
The beat is heavier, it is usually more fast paced, and the lyrics are nigh indecipherable. The two tend to cross over- especially when rock goes into an emotional high pitch.
I believe metal is a sub-genre of rock.
The main difference is that metal tracks typically contain loud, distorted guitars, with a song structure of Intro-->Verse-->Refrain(Repeat verse and refrain over and over)-->Solo-->Verse-->Refrain-->Outro. Hope this helps :)
Metal tends to be darker, more intricate, and faster at times. Though there are PLENTY of acceptions, don't get me wrong, it's more of a feel than anything.
