There are  3 methods of learning .

1  Auditory means we learn by hearing.

2  Visual, means learning by watching

3 . Kinesthetic  means by doing 

Auditory :- The things you hear, You  remember for a limited period of time and than we  forget

Visual :- The things you see in graphics you remember for a long period of time because the visual image stores in our right side of our brain here i have to mention that brain is divided into two parts right side and left side whatever we hears stores in our left side brain and whatever we see the visual image stores in our right side of brain.

 The right side of brain has capacity of holding data for a long period of time that’s why we remember visual things for a long period of time

Kinesthetic  :- The things you  do yourself, remember forever

Although all the methods are good enough for learning but science proves that visual and kinesthetic methods are the  most effective methods in terms of learning anything, 

As you see that most of the schools adopted smart classes concept in which teachers explain the concept on screen and students understand the concept very easily because of visual approach and they remember it for a long period of time.

Next example is in our childhood we all have seen Ramayana on television screen, so now if somebody asks about Ramayana we all  can easily answer about their character and story instead of any other scripture. 

As described  above, the importance of the right brain and left brain here. I have to mention that People who are right handed, their left brain works more and the  people who are left handed, their right brain works more. Means  in an X cross manner .

Left handed People are more creative and their memories are more powerful . 

When Both hands work on an abacus tool so that the whole brain get activated and the child  utilizes both segments of the  brain and  sets the beads in the mind , this way Abacus improves Memory.