Software Bug

Definition - What does Software Bug mean?

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.

Techopedia explains Software Bug

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:

  • In the 1980s, bugs in the code controlling the machine called Therac-25, used for radiation therapy, lead to patient deaths.
  • In 1996, the $1.0 billion rocket called Ariane 5 was destroyed a few seconds after launch due to a bug in the on-board guidance computer program.
  • In 1962, a bug in the flight software for the Mariner I spacecraft caused the rocket to change path from the expected path.
  • In the 1990s, a bug was found in the new release of AT&T’s software control #4ESS long distance switches caused many computers to crash.
Posted by:
Recommended For You close
Unix/Linux Shells 101

Read More »

Connect with us

Techopedia on Linkedin
Techopedia on Linkedin
Tweat cdn.techopedia.com
Techopedia on Twitter


'@Techopedia'
Sign up for Techopedia's Free Newsletter!

Email Newsletter

Join 138,000+ IT pros on our weekly newsletter

Resources
Free Whitepaper – Bridging the IT Operations Application Owner Gap
Free Whitepaper – Bridging the IT Operations Application Owner Gap:
Conflicting organizational needs all too often create tension between functional silos. Application owners demand more and more resources.
Free 30 Day Trial – VMTurbo Operations Manager
Free 30 Day Trial – VMTurbo Operations Manager:
VMTurbo's flagship product, Operations Manager maintains your virtual and cloud environments in a healthy state. It manages homogeneous and...