A software bug is an error or flaw in a computer program that causes it to behave unexpectedly or incorrectly. These bugs can lead to crashes, incorrect results, or even security vulnerabilities. They can occur for various reasons, such as mistakes in the code, misunderstandings of requirements, or unexpected interactions between different parts of the software. When developers discover a software bug, they typically work to fix it through a process called debugging. This involves identifying the source of the problem, making the necessary changes, and testing the software again to ensure it works as intended. Fixing bugs is an essential part of maintaining software quality and user satisfaction.