Selenium WebDriver is the successor to Selenium RC, a portable software testing framework for web applications. Selenium WebDriver accepts commands and sends them to a browser. This is implemented through a browser-specific browser driver, which sends commands to a browser, and retrieves results. wikipedia.org

Mobile application testing is a process by which application software developed for hand held mobile devices is tested for its functionality, usability and consistency. wikipedia.org

Software testing is an investigation conducted to provide stakeholders with information about the quality of the product or service under test. wikipedia.org

Manual testing is the process of manually testing software for defects. It requires a tester to play the role of an end user, and use most of all features of the application to ensure correct behavior. wikipedia.org

Object-oriented programming (OOP) is a programming paradigm using "objects" _ data structures consisting of data fields and methods together with their interactions _ to design applications and computer programs. wikipedia.org

Usability testing is a technique used in user-centered interaction design to evaluate a product by testing it on users. This can be seen as an irreplaceable usability practice, since it gives direct input on how real users use the system. wikipedia.org