Memory is the brain ability to store and retrieve information related to previous experiences.Memory occurs in two stages: short -term and long-term. Short-term memory reflects an immediate sensory perception of an object or idea that occurs before the image is stored.Short-term memory enables you to dial a telephone number looking it up but without looking at the number directly. If you call the number frequently, it becomes stored in long-term memory and can be recalled several weeks after you original looked it up. Short-term memory and long-term memory can be thought of as memory structures, each verying as to how much information it can hold and for how long.