Bidentate ligands are molecules that can attach to a central metal atom at two distinct sites. This dual attachment allows them to form stable complexes, which are important in various chemical reactions and processes. Common examples of bidentate ligands include ethylenediamine and oxalate. These ligands play a crucial role in coordination chemistry, where they help stabilize metal ions in solution. By forming chelate rings with the metal, bidentate ligands enhance the stability of the resulting complex, making them valuable in fields such as biochemistry and industrial catalysis.