Introduction of the term slowly changing dimensions

Question

Provide a brief introduction of the term slowly changing dimensions (or SCD)?

Answer 1

SCD are dimensions whose data alters very gradually. An instance of this can be city of a worker. This dimension will alter very gradually. The row of this data in the dimension can be either putted back totally with no any track of old record OR a new row can be putted in, OR the alter can be tracked.