Can you recite the alphabet easily and quickly? Can you write your name easily? Can you play the scale on a musical instrument?

You would probably say that you memorized all this. But what you actually did was to learn them. And the way you learned them was by forming a habit! In other words, what was once quite difficult for you, such as reciting the alphabet or playing the scale, became easy and almost automatic when you formed a habit of doing it. So memory can be described as learning by means of forming habits.