Software bug

A software bug is a problem with the code in a computer program which makes it not work properly. They can cause inconvenience to the user and may make their computer crash or freeze. Most computer programs have bugs. A program that has a large number of bugs (or possibly a single or a few serious bugs) is said to be buggy.

Most bugs are caused by bad programming by the developer, but sometimes they can be caused by compiler problems. When bugs are found, people send bug reports to the developer to tell them about the bug and let them fix it.

Sometimes, people say that their computer has a bug when something is wrong with it. The problem is usually caused by a computer virus which has infected their computer and is making it slow or do different things.

Some bugs are harmless, for example, many video games incorrectly allow objects to move through walls. Other bugs are more severe, for example, a bug in a navigation system that causes an airplane to explode.

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Misbugs

A misbug is a bug that has been used as a feature. An example would be a bug in an Android phone that allows users to gain root access.

Hardware bugs

Some bugs affect hardware (the physical parts of a computer) instead of software. For example, running the instruction lock cmpxchg8b eax on old Pentium processors would cause the processor to stop working until rebooted. Since hardware bugs are physical design flaws, they can not be corrected with a software update, although it may be possible to work around (hide) the bug with a software update.