User Input
User input refers to any data or commands provided by a user to interact with a software application, system, or device, typically through interfaces like keyboards, mice, touchscreens, or voice commands. It is a fundamental aspect of human-computer interaction that enables users to control, navigate, and communicate with digital systems. In development, handling user input involves capturing, validating, processing, and responding to this data to ensure functionality, security, and usability.
Developers should learn about user input to build interactive and user-friendly applications, as it is essential for features like form submissions, game controls, and command-line interfaces. Understanding user input is crucial for implementing security measures such as input validation and sanitization to prevent vulnerabilities like SQL injection or cross-site scripting (XSS). It applies across web, mobile, desktop, and embedded systems, making it a core skill for creating responsive and secure software.