First Computer “Bug” (1947)

The first recorded computer "bug" occurred on September 9, 1947, when engineers found a moth trapped between relay contacts in Harvard University's Mark II computer, which they taped into the logbook with the note "first actual case of bug being found." While the term "bug" for mechanical faults predates computers by decades (Thomas Edison used it in 1878), this incident popularized "debugging" in computer terminology and became legendary in programming culture.

Why First Computer “Bug” (1947) Matters

The Harvard Mark II moth incident represents both the evolution of engineering terminology and the intersection of mechanical and digital systems in early computing. While the moth didn't originate the term "bug" (which existed in engineering since the 1800s), it created the foundational narrative that connected physical debugging with software debugging, influencing how programmers think about finding and fixing problems in code.