Software Testing is a method to check whether the actual software product matches expected requirements and to ensure that software product is Defect free. It involves execution of software/system components using manual or automated tools to evaluate one or more properties of interest. The purpose of software testing is to identify errors, gaps or missing requirements in contrast to actual requirements. Some prefer saying Software testing as a White Box and Black Box Testing. In simple terms, Software Testing means the Verification of Application Under Test (AUT). This tutorial introduces testing software to the audience and justifies its importance.Software engineering is the only engineering discipline where product testing is a major technical and organizational concern, as well as an important cost factor. Software testing as an integral part of software quality assurance. We view software testing as part of a comprehensive strategy for software quality assurance, alongside many other techniques. The main emphasis is on principles and practices. Testing has attracted significant interest over the past decade, the compensation levels of testing functions are on the rise.Software engineering is the only engineering discipline where product testing is a major technical and organizational concern, as well as an important cost factor. Software testing as an integral part of software quality assurance. We view software testing as part of a comprehensive strategy for software quality assurance, alongside many other techniques. The main emphasis is on principles and practices. Testing has attracted significant interest over the past decade, the compensation levels of testing functions are on the rise.