Use this tag when referring to domains in relation to attributes, geodatabases and in the GIS field in general

Esri describes domains as the following:

Attribute domains are rules that describe the legal values of a field type, providing a method for enforcing data integrity. A domain is a declaration of acceptable attribute values. Attribute domains are used to constrain the values allowed in any particular attribute for a table or feature class. If the features in a feature class or nonspatial objects in a table have been grouped into subtypes, different attribute domains can be assigned to each of the subtypes. Whenever a domain is associated with an attribute field, only the values within that domain are valid for the field. In other words, the field will not accept a value that is not in that domain. Using domains helps ensure data integrity by limiting the choice of values for a particular field.

Attribute domains can be shared across feature classes, tables, and subtypes in a geodatabase.

For example, a feature class for water mains and a feature class that stores water laterals can use the same domain for the ground surface type field.

https://pro.arcgis.com/en/pro-app/help/data/geodatabases/an-overview-of-attribute-domains.htm

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