tmpfs
tmpfs is a temporary file storage system in Unix-like operating systems that uses RAM (or swap space) to store files, providing fast read/write access. It is typically mounted as a filesystem in memory, where data is volatile and disappears on system reboot or unmounting. This makes it ideal for storing temporary data like caches, session files, or other transient information that benefits from high-speed access.
Developers should use tmpfs mounts when they need extremely fast I/O operations for temporary data, such as in-memory caching for web applications, storing session data in high-traffic servers, or handling temporary files in containerized environments like Docker. It is particularly useful in scenarios where disk I/O latency is a bottleneck, as it leverages RAM for storage, though it should not be used for persistent data due to its volatile nature.