Enolates are anions derived from the deprotonation of carbonyl compounds. This tag must be used while dealing with the enolates or its derivatives including its resonance forms.
As defined in the IUPAC Gold book:
Enolates are salts of enols (or of the tautomeric aldehydes or ketones), in which the anionic charge is delocalized over oxygen and carbon, or similar covalent metal derivatives in which the metal is bound to oxygen.
Enolates, also termed as oxyallyl anions, are versatile reagents for the formation of α-substituted carbonyl compounds and are therefore important intermediates for the synthesis of complex molecules. The stereochemical outcome of an enolate reaction often depends on the geometry of the enolate and therefore the selective formation of enolates is a key step in many bond-forming processes.
Enolates occur commonly in only two forms: the metal may be found either closer to the oxygen or closer to the carbon atom. Groups I, II and III enolates exist as O-metal tautomers. These strongly electropositive metals bind closely to the oxygen atom. Among transition metal enolates both types of enolates are observed. In a few transition metal enolates the cation is associated with a delocalized enolate anion (η3-enolate complexes).
More information in wiki page: https://en.m.wikipedia.org/wiki/Enolate#