Input handling refers to the process of receiving and processing data from users or external sources in a software application. This can include keyboard inputs, mouse clicks, touch gestures, or data from files and sensors. Proper input handling ensures that the application can interpret and respond to user actions effectively. Effective input handling also involves validating and sanitizing the data to prevent errors and security vulnerabilities. For example, when a user enters information into a form, the application checks that the data is in the correct format and free from harmful content. This is crucial for maintaining the integrity of the application and protecting user information.