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Correct answer: Moth
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A literal bug (a moth) was trapped inside Harvard's Mark II computer in 1947. Something interesting though: Thomas Edison did use "bug" in the same sense in a letter in 1878. And the term "debug" was used in 1945 (preceding the moth incident) in the Journal of the Royal Aeronautical Society.
The bug that the term "debugging" originates from is a moth. It was found trapped in the Mark II Aiken Relay Calculator by Admiral Grace Hopper.
For a higher resolution image, click here.
The terms "bug" and "debugging" are popularly attributed to Admiral Grace Hopper in the 1940s. While she was working on a Mark II computer at Harvard University, her associates discovered a moth stuck in a relay and thereby impeding operation, whereupon she remarked that they were "debugging" the system.
Admiral Grace Hopper in the 1940s. While she was working on a Mark II computer at Harvard University, her associates discovered a moth stuck in a relay and thereby impeding operation, whereupon she remarked that they were "debugging" the system.
Grace Hopper's Moth
There was a literal Moth stuck in the Mark II computer at Harvard and which while removing Grace Hopper called 'debugging'
moth
a moth stuck inside a Mark II!
A moth..that got stuck lol
From a literal bug, a moth, caught in Harvard's Mark II computer
Moth
A moth... I'm pretty sure!
Moth
It was stuck in a relay and thereby preventing operation, whereupon Grace Hopper's associates remarked that they were "debugging" the system.
Grace Hooper found and removed a moth stuck in a computer.
Moth
A moth stuck in a relay during Mark II development
A Moth
A moth
A moth. Grace Hopper and her associates discovered a moth stuck in the relay while working on the Mark II.
Popularly attributed to Admiral Grace Hopper's comments after a moth was found in the Mark II computer, but was apparently used in aeronautics before computers
moth
Admiral Grace Hopper's discovery of a moth trapped in a relay
A moth, because it was stuck in a relay and thereby impeding operation. Then removing it would be considered "debugging" the system.
Moth
a moth!
Moth
moth
An actual moth that was trapped in a Mark II computer being worked on by Admiral Grace Hopper while she was at Harvard University.
Moth
A moth
Moth
Moth
Moth
They found a moth ( aka a bug) in one of the early computers.
a moth
A moth
A moth
a moth stuck in a relay and thereby impeding operation
A Moth
Bugbear