Bug

Jargon often used in the computing world to refer to a fault in software (and sometimes hardware) that causes a malfunction. Bugs may range from minor annoyances that are easily worked around to crippling problems. Sometimes a software program can have so many problems it gets characterized as “buggy.” According to folklore, the first computer bug was an actual bug. Discovered in 1945 at Harvard, a moth trapped between two electrical relays of the Mark II Aiken Relay Calculator caused the whole machine to shut down. It turns out that the person who told the story was already aware of the usage of the term as it dates all the way back to the early telegraph days. Some claim the usage is actually older than that. These days you will see the term applied to any system (computer or otherwise) that runs with any type of program or set of instructions. This could be a keyboard, a hard disk recorder, or even a calculator.