Memory can be defined as the capacity to keep information available for later use. The process of memory can be divided into four aspects learning, retention, forgetting and retrieval. The initial storage of information is called learning. Keeping the new information available is called retention. The loss of new information over a period of time is called forgetting & utilization of stored information is called retrieval.

There are two basic theories to explain the process to memorize events. According to one theory, memory is said to be stored in the brain as a memory trace. When we learn or experience something, impulses are generated in the nerves of the brain. These impulses impart their effects in the brain in the form of a record.

According to second theory, sensations created by learning produce some permanent changes in the brain which remain there in the form of memory. To quote some renowned biologists, the R.N.A. present in the brain keeps on increasing from the age of three to the age of forty. During these years, the memory of man also increases. The quantity of R.N.A. is almost constant from the age of 40-55 years. Therefore, man’s memory is almost constant during this period. After the age of 60, the quantity of R.N.A. starts decreasing and so does the memory.

The only effective way of remembering something is to repeat it many times. Interest factor is also very important. Boring thing are much more difficult to remember than something that we understand and are interested in. Motivation and desire to do something are important factors.