When were microcomputers or personal computers first introduced?

The introduction of microcomputers, or personal computers, primarily began in the 1970s. This era marked a significant shift in computing as technology became more accessible to individuals and smaller businesses, transitioning from large mainframe systems that were costly and complex. The release of notable models like the Altair 8800 in 1975 and the Apple II in 1977 highlighted the advancements in hardware design that catered to personal use.

The 1980s saw a surge in the popularity and variety of personal computers, with models like the IBM PC and the Commodore 64 further cementing the technology's place in homes and schools. This decade is often considered the golden age for the development and evolution of personal computers, leading to widespread adoption and the diversification of software.

Therefore, while the 1980s and 1990s were significant for the growth and consolidation of personal computing, the correct answer points to the 1970s as the actual period when it all began, thus setting the foundation for future developments in the following decades.