Data cleansing, data washing or data scrubbing as it is often referred to, is a process of correcting and eliminating inaccurate (defects) records from a particular network, server, database or data warehouse. The purpose of data cleansing is to find errors or wasteful pieces of irrelevant information and delete or correct them. This ensures that data being used is accurate according to what is needed. Data cleansing is a powerful way to improve information and can be performed by following the 5S System.
Reference: Infyzoom.com - Data Cleansing