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A software bug is a problem causing a program to crash or produce invalid output. The problem is caused by insufficient or erroneous logic. A bug can be an error, mistake, defect or fault, which may cause failure or deviation from expected results.
Most bugs are due to human errors in source code or its design. A program is said to be buggy when it contains a large number of bugs, which affect program functionality and cause incorrect results.
Some bugs might not have serious effects on the functionality of the program and may remain undetected for a long time. A program might crash when serious bugs are left unidentified. Another category of bugs called security bugs may allow a malicious user bypass access controls and obtain unauthorized privileges.
Some of the worst bugs in history include: