What is a pseudo file system?
File system is a method of laying off files and folders on a physical hard disk. Within Linux, every file and folder is actually nothing more than just a file itself. The hard drive, network information, keyboard, display monitor. Everything is seen as a file within Linux.
A pseudo file system, on the other hand, does not exist on a physical hard disk. It actually is created by the Linux Kernel after the computer boots up, and it only exists and RAM while the system is up and running. Once you shut your computer off, that file system no longer exist as it gets wiped out when the RAM is cleaned. When your system boots up, the kernel would create another pseudo file system, using the same directories that will hold all of the information that the kernel in a system uses.
There are multiple pseudo files systems that are used within Linux, but the two main ones are