There exists three types of RNA, messenger RNA (mRNA), transfer RNA (tRNA), ribosomal RNA (rRNA), each type performing different tasks within the cell.
The messenger RNA (mRNA) represents a transcription from one section of DNA ad it corresponds to a single gene. This strand of messenger RNA (mRNA) is transported from the nucleus to the structures found in the cytoplasm, called ribosomes. The message contained by mRNA is interpreted by ribosomes and then, according to this message, a protein is created.
A protein is a polypeptide chain where various amino acids join together in a special order. There exists 20 different amino-acids and the appropriate amino acid added to the polypeptide chain by the tRNA is caused by the different combination of 3 mRNA bases. The ATP hydrolysis process releases the energy needed in the codon-anticodon bases process pairing.
The completed protein structure is ready when the addition process of amino acids ends at the stop code and the polypeptide chain is released.
Hence, proteins are the end products of multi-step particular ordered process DNA-RNA-proteins.