What are the differences between cDNA and CDS, and how do they impact gene expression and protein synthesis?

cDNA is a complementary DNA copy of an mRNA molecule, while CDS (coding sequence) is the part of the gene that encodes the protein. cDNA is used to study gene expression and can be used to produce proteins in recombinant DNA technology. CDS directly impacts protein synthesis by providing the instructions for the amino acid sequence of the protein.