Software testing is one of the key phases in the lifecycle of software development whose aim is to verify that the software right was built by the development team and to validate that the software designed meets the customer requirements. Quality assurance of software is a vast domain, covering a wide range of techniques, methodologies, and tools. Thus, even though QA’s main purpose is unified, it is important to divide this process into more specific domains like manual vs. automation testing. Manual testing: One of the two main forms of testing is manual software testing, where test cases are performed without any automation tools or scripts. Manual testers verify that the functionality and design of the software are correct by preparing test plans, developing test cases, manually implementing them, and preparing reports upon execution of test cases. As a result, they identify visible and hidden defects in software and actual outputs. In fact, it is preferable not for every application development project or test team to use automated testing tools. In QA manual testing will never go away. Advantages of manual testing: Speed and flexibility Human feedback Visual feedback Disadvantages of manual testing: Higher chance of errors Time-consuming nature of the process Testing limitations Automation testing: The Automation Software Test is the type of testing carried out using tools and scripts for automation. So a QA engineer must be able to use programming tools to write pre-scripted automation tests to get into the automation testing. It is preferable to introduce test automation software in a whole bunch of cases in a project because there are problems that manual testing is unable to deal with. Strong differences between the two kinds of testing make individuals wonder whether manual testing can be replaced by automation testing. Before arriving at a clear-cut solution there are automation pros and cons to consider. Advantages of automation testing: Cost-effective for large-scale projects Better software testing coverage Faster result delivery Easier reporting Disadvantages of test automation: Expensive for small projects A lack of human expertise