Read evaluate print loop(Repl)

also known as an interactive toplevel or language shell, is a simple, interactive computer programming environment that takes single user inputs, evaluates them, and returns the result to the user.

Read function accepts an expression from the user, and parses it into a data structure in memory.

Evaluation function takes this internal data structure and evaluates it.

Print function takes the result yielded by evaluating them, and prints it out to the user.

for more info: https://en.wikipedia.org/wiki/Read%E2%80%93eval%E2%80%93print_loop

REPL can be created to support any language. REPL environment allows users to access relevent features of an operating system and to provide access to programming capabilities.