Application testing refers to the process of evaluating and assessing the functionality, usability, and overall quality of a software application before it is released to the public. This involves conducting various tests and simulations to identify any bugs, errors, or flaws in the application and ensuring that it meets the desired standards and requirements. The goal of application testing is to improve the user experience and ensure the smooth and efficient functioning of the application, ultimately leading to a successful and satisfactory end product for the end user.