The Commodore 64, released in 1982, became popular due to several key factors:

1. Affordability: The Commodore 64 was relatively affordable compared to other computers. It retailed for $595 at launch, which was considerably cheaper than many other home computers available at the time.

2. Hardware capabilities: The Commodore 64 offered impressive hardware capabilities for its price. It had a 1 MHz 8-bit MOS Technology 6510 microprocessor, 64 kilobytes of RAM, and a custom graphics and sound chip called the VIC-II and SID, respectively. These features allowed for advanced graphics and sound capabilities, making the Commodore 64 stand out among its competitors.

3. Software library: The Commodore 64 had a vast library of games, educational software, productivity tools, and programming languages. It attracted both gamers and enthusiasts interested in programming and software development.

4. Compatibility: The Commodore 64 had a large user base, which meant developers and publishers were motivated to create software and games specifically for the system. This compatibility ensured a steady stream of new releases and a vibrant community around the computer.

5. Ease of use: The Commodore 64 had a user-friendly interface and BASIC programming language built into the system. This made it accessible to beginners and encouraged users to explore programming and create their software.

6. Marketing and distribution: Commodore International, the company behind the Commodore 64, had effective marketing strategies, including aggressive pricing and widespread distribution. They targeted a wide range of markets, from home users to schools and businesses, expanding the reach and popularity of the computer.

All these factors combined made the Commodore 64 a trendy and influential computer in the 1980s, with an estimated 17-20 million units sold worldwide. Its affordability, hardware capabilities, software library, and user-friendly interface contributed to its success and enduring legacy.