Software failure refers to a situation where a software application does not perform as intended, leading to errors, crashes, or unexpected behavior. This can occur due to various reasons, including coding mistakes, inadequate testing, or compatibility issues with hardware or other software. Such failures can disrupt user experience and may result in data loss or security vulnerabilities. Common examples of software failure include bugs in operating systems like Windows or macOS, which can cause system instability. Additionally, applications like web browsers or mobile apps may experience failures that hinder their functionality, affecting millions of users worldwide.