How do graphics cards work
Say you are trying to melt ice. Well, you could just leave it out in the open to melt. Or you could channel your inner Walter White (the good chemistry) and add some table salt which lowers the freezing point of ice causing it to melt faster. Why? Why not.
A graphic card acts like salt in the computer system. Basically, it speeds up the rendering and creation of computer images. Additionally, it ensures you get the best quality of whatever is displayed on your screen or adds taste to your images (just like salt!).