Question

what is the difference between RNA nd DNA

Answer 1

DNA, or deoxyribonucleic acid, is like a blueprint of biological guidelines that a living organism must follow to exist and remain functional. RNA, or ribonucleic acid, helps carry out this blueprint's guidelines. Of the two, RNA is more versatile than DNA, capable of performing numerous, diverse tasks in an organism, but DNA is more stable and holds more complex information for longer periods of time.

Answer 2

DNA is  deoxyribonucleic acid . DNA is the functional unit in genetics.DNA is double stranded.
The nitrogen bases in DNA are
Adenine(A)
Guanine(G)
Cytosine(C)
Thymine(T)

RNA is ribonucleic acid, Which helps in protein synthesis. Giving proper messages for Dna is the main function of RNA. 
RNA is single stranded
Nitrogen bases in RNA are :-
Adenine(A)
Guanine(G)
Cytosine(C)
Uracil(U)