I am a collage student.When I buy this laptop I have no idea about this.But when I start this laptop.I am surprised WOW it has good features.And its best for me and others.I purchase this item because I love dell items for its better features than others.It has HD screen and better RAM.and its good looking.And the joystick is very cool.It works well and speedy.It charge fast and good bettry .It has 6 cells bettry .And when you play video and Movie It has awesome sound.Must buy this item. And I hope you Enjoy it.