A fractal is a pattern that keeps repeating itself no matter how far you zoom into or out of it.
Say you take half a circle, then at one end, start to complete the circle, but your second half, is only half as big as the first, at its tip invert and divide the diameter by two again, can you see you are building a spiral, and how you could go on to infinity in both directions, oh yes there are diffirent sizes of infinity, but don't break your brain an that now.