Final answer:
Computers progressed from room-sized behemoths to modern personal computers through advancements in technology that reduced their size, cost, and complexity.
Step-by-step explanation:
In the late 1970s and early 1980s, computer manufacturers like Apple, Commodore, and Tandy began offering fully assembled personal computers. These computers became a common sight in businesses and upper-middle-class homes. The invention of the microchip further reduced the size and cost of computers, making them accessible to ordinary consumers. Over time, computers became smaller, more powerful, and more user-friendly, leading to the development of today's personal computers.