Video Cards

Okay, I don't know what these are for outside of the obvious and I never really understood why people take apart their computers but I assume it's the same thing as fixing up your car. All I know is as long as it functions, I don't mess with it. LOL I guess people that play games and do more than surf the net like to have parts that are better than the stock that the computers come with. I would assume that a better video card would help viewing things with higher graphics go a lot better or just run at all. I should ask my friend's hubby, he's a geek, he should know. ;-)