Software bugs are part of life. An app crashes, an email won’t send, a business system starts doing something strange. Annoying, and bad for productivity.
But have you ever wondered why we call them “bugs”?
The famous moth of 1947
On 9 September 1947, the team running the Harvard Mark II computer found the machine wasn’t working properly. When they went looking, they found a moth stuck in one of its electromechanical relays. They removed it and taped it into the logbook with the note: “First actual case of bug being found.”
The story is often linked to computing pioneer Grace Hopper, who was working on early computers with that team at the time.
Funnily enough, engineers were calling technical faults “bugs” long before computers came along. The word was being used in engineering and telecommunications back in the late 1800s. The moth wasn’t the first use of the term, but it’s the most famous, and it helped make “bug” part of everyday computing language.
Where bugs come from today
Thankfully, real insects are rarely the cause of IT problems these days. Modern bugs usually come down to one of these:
Human error. People write software, and people make mistakes. A typo, a wrong calculation or a missed requirement can all cause odd behaviour.
Complexity. Business systems can involve thousands or even millions of lines of code, all talking to databases, networks, cloud services and other applications. The more moving parts, the more chances something won’t behave quite as expected.
Things changing around it. Software can work perfectly when it’s built and then run into trouble after:
- an operating system update
- new hardware
- security patches
- cloud platform changes
- connecting it to a new application
Things nobody expected. Users are wonderfully creative. They’ll find ways to use software that the developers never imagined, and what looks obvious afterwards is often hard to predict up front.
The bug hunt never ends
Even with better testing, automation and quality checks, bugs aren’t going away. Systems are more sophisticated than ever, which is why every business needs good monitoring, regular maintenance and support from people who already know their setup.
The good news is that most bugs can be found and fixed quickly when the right processes and support are in place. From a moth in a relay in 1947 to today’s cloud apps, the job is the same: find the problem early and fix it before it hurts the business.
AI is joining the hunt
Technology is also getting better at finding bugs before they become a problem. Developers are increasingly using AI (Anthropic’s Mythos is one example) to pick up potential issues during development and testing. It doesn’t replace human expertise. Think of it as an extra pair of eyes that helps teams spot problems faster and more consistently.
Tired of the same IT bugs coming back again and again? Book a free health check, or call us on 0800 688 768.