Data cleansing is validating and verifying the data in complaince to the coustomer's country rules like postal code is different for each and every place.

We perform other data cleansing techniques such as currency conversions, abbreviation expansion, data integrity audits (so fields that should contain numbers don't have text in them), de-duping and data appending based on other files (often a client supplied house file, master client list, product list, price list, etc)