What is Lactam Lactim Tautomerism?

Hint: A particular example of amide-imidol tautomerism is lactam-lactim tautomerism. A type of tautomerism that occurs when a hydron migrates between the oxygen and nitrogen atoms during lactamlactim interconversion.

Complete answer:
Tautomers are chemical compounds that have structural isomers (constitutional isomers) that rapidly interconvert. The translocation of a hydrogen atom is a common outcome of this reaction. Tautomerism affects the behaviour of amino acids and nucleic acids, two of life's most essential building components. Tautomerism is the term for the concept of tautomerizations. Desmotropism is another name for tautomerism.
Lactim is (organic chemistry) any of a class of cyclic hydroxy-imides (enols) that are tautomeric with lactams, whereas lactam is (organic chemistry) any of a class of cyclic amides that are nitrogen analogues of lactones, generated by heating amino acids; the tautomeric enol forms are known as lactims. Lactim is a type of cyclic carboximidic acid with an endocyclic carbon-nitrogen double bond. Lactams undergo tautomerization, which results in the formation of these molecules.

Note:
It's important not to mix up tautomers with chemical resonance portrayals of "contributing structures." Tautomers are chemical species that may be distinguished by their spectroscopic data, but resonance structures are only representations and do not exist physically.