ELI5: Explain Like I'm 5

Shim (computing)

A shim is a small piece of software (code) which helps two different pieces of software on a computer work together. It acts as a bridge between two different programs and makes them work better together. It is like when two people don't speak the same language and need someone to help them communicate with each other. The shim helps the two pieces of software communicate and understand each other.