Our best bud Google says that “Aspect ratio is the ratio of the width to the height of an image or screen.” 

Still not sure? Picture this. 

You have a stick that you’ve picked up off the ground. It doesn’t matter what the length of the stick is. You decide that you want to make some shapes with the stick. You make a square. The bottom (width) of the square is 1 stick long, and the side (height) is 1 stick long. As long as the width and the height are the same, it’s a square. (2 sticks by 2 sticks, 3 by 3, all squares)

If you want to make a rectangle, you can have a bottom be two sticks long, and the height 3 sticks high. 

The best parts of aspect ratios are that your images can be different sizes but as long as your ratio is the same all of you images will show up the same on your page.