For cloning, you need DNA from a animal. DNA is Deoxyribonucleic acid, a self-replicating material present in nearly all living organisms as the main constituent of chromosomes. It is the carrier of genetic information.
Another thing you need is a genes. A gene is a distinct sequence of nucleotides forming part of a chromosome, the order of which determines the order of monomers in a polypeptide or nucleic acid molecule which a cell may synthesize.
A clone is a copy of the original thing. Knowing what these words mean lets me understand cloning because those are what the scientists use for cloning.