ddr2?

I’ve been looking around for a motherboard and a friend said some stuff about DDR2 instead of DDR for speed and stuff… So I was just wondering, does “2 DDR channels” mean that I can use DDR2 on the motherboard? I know almost nothing about hardware, especially when it comes to RAM :smiley:

Just curious, cause I can’t find any motherboard that says “DDR2 compatible” or something in that fashion…

EDIT: And can someone please explain what DDR2 really is :smiley: I don’t really get it I:-)