In software, a Bug is an error or flaw in the code that causes a product to behave in unintended or incorrect ways. Bugs can range from minor visual glitches (like an icon not displaying correctly) to major functional issues (like a app crashing when trying to upload a photo). From a UX perspective, bugs are problematic because they disrupt the user experience — they can cause confusion, frustration, or even prevent the user from completing tasks. For instance, if clicking a “Sign Up” button does nothing due to a bug, users will be unable to register for the service, leading to a poor impression and likely abandonment. Part of the UX process involves identifying bugs through testing (quality assurance and usability testing) and working with developers to get them fixed. A smooth, polished experience with minimal bugs is crucial; users generally don’t differentiate between “design” and “development” issues — they simply experience a product as a whole, so any bug can reflect poorly on the overall quality of the product’s design and execution.