Today, computers are everywhere. You might use one to do homework, watch videos, or play games. But computers have not always been small enough to carry in a backpack. The story of computers stretches back hundreds of years, from simple counting tools to the powerful machines we use today. Along the way, brilliant inventors and determined engineers turned wild ideas into real technology that changed the world.
Long before electricity was discovered, people needed help with math. Around 3,000 years ago, people in places like China and the Middle East used the abacus, a wooden frame with rows of sliding beads. By moving the beads back and forth, people could add, subtract, multiply, and divide large numbers quickly. The abacus was one of the earliest computing devices, and some people around the world still use it today.
In the 1830s, a British mathematician named Charles Babbage designed a machine called the Analytical Engine. It was never fully built during his lifetime, but the design was far ahead of its time. It had many of the same basic ideas that modern computers use, including a way to store numbers in memory and follow step-by-step instructions. A mathematician named Ada Lovelace studied Babbage’s machine carefully and wrote detailed notes explaining how it could be programmed. Because of this work, Lovelace is often called the first computer programmer.
The first electronic computers appeared in the 1940s. One of the most famous was ENIAC, which stood for Electronic Numerical Integrator and Computer. Built at the University of Pennsylvania, ENIAC was completed in 1945 and weighed about 30 tons, roughly the weight of five elephants! It filled an entire room and used about 18,000 vacuum tubes, which were glass bulbs that controlled electrical signals. ENIAC could perform around 5,000 addition problems per second, which was very fast for its time but far slower than even a basic phone today.
For decades, computers were huge, expensive machines used only by governments, universities, and large companies. That began to change in the 1970s. In 1977, Steve Wozniak and Steve Jobs released the Apple II, one of the first personal computers designed for regular families. It could display color graphics and even play simple games. In 1981, IBM released its own Personal Computer, known as the IBM PC. It ran an operating system made by a young company called Microsoft. Suddenly, computers were showing up in homes, schools, and offices around the world.
Modern computers are millions of times more powerful than ENIAC, yet they fit in your pocket. A smartphone contains more computing power than all of NASA had when it sent astronauts to the Moon in 1969. Laptops, tablets, and smartwatches keep getting smaller, faster, and more capable every year. Computers help doctors diagnose diseases, help scientists explore space, and let people around the world talk to each other instantly.
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