Lolth sworn drow are usually from Menzoberranzan, the drow major city in the underdark. Its a matriarchy with ruling houses devoted to the spider queen Lolth. In general they are pretty evil, but not all. Dritz is from Menzoberranzan, so is the mercenary company Bregan D'aerthe (which is usually formed of noble male drows). They were led by a man who's name is Jarlaxle who you meet in baldur gate 2, he's not evil more of a chaotic neutral Rogue.
Seldarine drow are drow who usually worship Eilistraee ( A good diety). She is the daughter of Corellon Larethian (elf main god) and Lolth.
