What is the main difference between first-generation and modern computers?

The primary distinction between first-generation computers and modern computers lies in the technology used for their operation. First-generation computers were built using vacuum tubes, which were bulky, generated a lot of heat, and were inefficient. These vacuum tubes were essential for processing and controlling electrical signals in early computing.

In contrast, modern computers utilize microprocessors, which are integrated circuits that can perform a multitude of operations at high speeds while being significantly smaller and more energy-efficient. Microprocessors have revolutionized computing, enabling the development of compact and powerful devices that perform complex calculations and tasks rapidly. This advancement in technology showcases the evolution of computers from large, unwieldy machines to today's sleek and efficient devices.