The term “Bug” actually predates computers because it was applied first to engineering and then it was applied to electronics before becoming computer jargon. As far as a computer bug is concerned the term was first used when an actual bug, a moth to be exact, was found to be the problem with an early computer called the Mark II in September of 1947. The bug or moth was found trapped in a relay and was the source of the issues the team was experiencing. Members of the team who were familiar with the electronics term “Bug” took the moth and taped it to their log book with the notation: "Relay #70 Panel F (moth) in relay. First actual case of bug being found."
The First Computer Bug Log Entry
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