APC (Alternative PHP Cache)

APC is a free and open-source opcode cache for PHP, designed to enhance the performance of PHP scripts by caching them in their compiled state.

More About APC:

Performance Enhancement: Significantly speeds up PHP applications by avoiding the need for PHP to load and parse scripts on each request.

Configuration and Usage: Can be easily installed and configured on a server running PHP.

Popularity and Transition: Once a popular choice, it has seen a decline with the advent of newer technologies.

Alternatives: Other caching solutions like Opcache have become more prevalent.