A Ramachandran plot is a way to examine the backbone conformation of each residue in a protein.
It was first used by noted Indian biophysicist G.N. Ramachandran in 1963 to describe stable arrangements of individual residues of a protein. Today, a Ramachandran plot is frequently used by crystallographers to identify protein models with an unrealistic backbone.
Ramachandran plot is used to examine and assess any structure in peptides.
Peptides are short chains of amino acids linked by peptide (amide) bonds.