Can you explain what the procfs filesystem in Linux is and how it works?

Procfs (process filesystem) is a virtual filesystem in Linux that displays information about the kernel's state and running processes in the form of files and directories.

It is usually mounted in the /proc directory and does not store data on disk, but generates it dynamically upon access. Through procfs, you can obtain information about processes, memory, devices, kernel configuration, and much more.

For example, the /proc/cpuinfo file contains information about the processor, and /proc/[pid]/status provides information about a specific process with the identifier pid.

Procfs is useful for system monitoring and diagnostics, as well as for interacting with the kernel from user space.