This document discusses the introduction, types, scopes, and needs of validation in the pharmaceutical industry. The major types of validation covered are process validation, cleaning validation, equipment validation, and validation of analytical methods. Process validation involves collecting data from design through production to establish a report. Cleaning validation ensures cleaning processes remove active pharmaceutical ingredients from equipment. Equipment validation checks that equipment works correctly. Validation of analytical methods assures methods used to test products are good. Validation is needed to decrease risks, assure production quality, control costs, and reduce recalls. A validation master plan outlines the validation program and policy.