Coding Sequence
<p>The coding region of a gene, also known as the coding sequence or CDS (from coding DNA sequence), is that portion of a gene's DNA or RNA, composed of exons, that codes for protein. The region is bounded nearer the 5' end by a start codon and nearer the 3' end with a stop codon. The coding region in mRNA is bounded by the five prime untranslated region (5'-UTR) and the three prime untranslated region (3'-UTR), which are also parts of the exons. The CDS is that portion of an mRNA transcript that is translated by a ribosome.
The coding region of an organism is the sum total of the organism's genome that is composed of gene coding regions. 
 
<img src="/6a9df276-3172-5623-9ca8-bb9b6090868f.png"/>    TE   Transposable Elements.
The Coding Sequence (CDS) is the actual region of DNA that is translated to form proteins. While the ORF may contain introns as well, the CDS refers to those nucleotides(concatenated exons) that can be divided into codons which are actually translated into amino acids by the ribosomal translation machinery.
 
<b>CDS - coding dna sequence</b> - > only sequence that is translated into protein
<b>ORF - open reading frame </b>-> entire gene sequence 5'-utr + transcript (all exons + introns) + 3'-utr
 
 
 
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