Peptide libraries are collections of diverse peptides, which are short chains of amino acids. These libraries are created to explore the vast combinations of peptides that can be synthesized, allowing researchers to study their properties and functions. They are essential tools in drug discovery, helping scientists identify potential therapeutic candidates for various diseases. Researchers use peptide libraries to screen for specific interactions, such as binding to proteins or receptors. By analyzing these interactions, scientists can develop new drugs or improve existing ones. The use of peptide libraries has advanced fields like biotechnology and pharmaceutical research, leading to innovative treatments and therapies.