Cloning is the process by which an exact, identical copy of the original can be made. Clones are those organisms that have identical genes. That means the sequence of their DNA is the same- an exact copy. Identical twins or triplets are also called clones. When you take out the leaf of a plant and plant it somewhere else, it can grow into the copy of the original plant.
Our body is made up of very tiny organisms called cells. These cells do their usual work which the DNA tells them to do. The DNA stands for de-oxy-ribo-nucleic acid which is the genetic code in all human beings. A child gets this genetic code- half from the father and half from the mother. When a child is formed- it is formed from one single cell; the egg cell, which has the DNA from the father and the mother. This cell then divides itself into millions to form a child. This is known as differentiation. Each cell is a copy of the original cell and has the same genetic code.