Game glitches are called bugs because the word for a software fault comes from older engineering usage—not from video games, and not from the famous moth found in a computer. That 1947 incident helped popularize the term, but “bug” was already being used for technical problems.
What does “bug” mean in a game?
A game bug is a fault in its software that causes something to behave incorrectly. A character might fall through a floor, an item might fail to appear, or a quest might stop progressing. “Glitch” is often used for the visible error or unexpected behavior; “bug” points to the underlying software fault. The words overlap in everyday gaming conversation.
The term is not a gaming-specific invention. Game software inherited the broader computing use of “bug” for a technical fault. The sources documenting the term’s history do not establish a separate origin in video games.
Was the word “bug” invented by the 1947 moth?
No. The moth story is memorable, but it did not coin the word. Historian Fred R. Shapiro’s 1987 article traces “bug” as a technical term to older engineering usage, including an 1878 quotation from Thomas Edison. Shapiro also points to an attestation of “debug” in 1945—before the moth appeared in the Mark II log. The Computer History Museum likewise notes that technical use predated the 1947 incident.
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What happened when the moth was found?
On September 9, 1947, engineers working with the Harvard Mark II computer found a moth caught between relay contacts. The team recorded the incident in the machine’s logbook, writing: “First actual case of bug being found.” The National Museum of American History holds the logbook; its collection record says the book was probably not Grace Hopper’s.
Hopper was associated with the Mark II team, but the log entry is not evidence that she coined “bug” or personally wrote it. The Smithsonian credits Hopper and the team with helping popularize “computer bug” and “debug.” That is why the moth anecdote became attached to the word’s history: it was a striking, literal example of a bug disrupting a machine, not the beginning of the term.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How did the old engineering term reach games?
As computers and software became common, “bug” continued to mean a technical fault, and “debug” meant finding and correcting faults. Video games are software, so players and developers use the same established computing vocabulary for errors in game code. A game bug may cause a visual glitch, break a feature, or disrupt play; the word’s history is in engineering and computing, not in a particular game or gaming incident.
In short, the moth made the history memorable, while older engineering usage explains why software faults—including those in games—are called bugs.
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