Question

what is dna copying?

Answer 1

This process is also termed as "cloning" You might have seen some movie in which 2 indivual are like they are produce by the same but they still have different hand print,taste,etc. Acutally DNA  copying is process to produce identical twins 
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Answer 2

Cells use chemical reactions to build copies of their DNA. This creates two copies of the DNA in a reproducing cell. DNA copying is accompanied by the creation of an additional cellular apparatus to facilitate the DNA copies to separate with its own cellular apparatus. DNA copying gives rise to some inbuilt tendency for variation during reproduction which is the basis for evolution.