Aiglx stands for "Accelerated Indirect GLX" which is a fancy way of saying it helps your computer show cool pictures and animations.
Imagine you have a big box of toy blocks (like legos). Each block has a different color and shape. Now let's say you want to build a tower out of these blocks. To make it look cool, you can stack the blocks in different patterns, colors, and shapes.
In computer terms, the blocks are like pixels (tiny dots that make up a picture). Aiglx is like a special tool that helps the computer stack the pixels in different patterns, colors, and shapes to make cool pictures and animations.
Without Aiglx, building the tower (or showing cool pictures and animations) would take a lot longer and not look as good. But with Aiglx, your computer can do it easily and quickly.