The process of acquiring new information can be generally divided into 3 categories: decoding, storage and retrieval. When the brain receives new information, it decodes it and then stores it. The stored information can then be retrieved in the future. If we cannot recall something (the so called “knowledge-gap”), something went wrong during one of these phases.
There are several types of memory: short and long-term memory, sensory memory etc. The latter receives information through the stimulation of the senses such as sight, touch, smell. The short-term memory, also called working memory, retains small amounts of information for short periods of time. We use it when we do mental calculations, remember a password, a code or a phone number. If we want to store a word, we have to put it into our long-term memory. How can we do it efficiently?
Memory is like a muscle, it atrophies if it does not work. Each capacity/faculty that is neglected tends to weaken and eventually disappear. So it must be constantly stimulated. The best way to do it is to repeat continuously. If you want your memory to work well, make it work a little bit everyday. The repetition of an operation has a cumulative effect whose main goal is that of forcing information into our brain without us making deliberate efforts.