Interpreter and Compiler

Question

Hello guys! I'm pretty interested in computer science and and programming! That's why I chose to make a programming language.
I made already a program that I run passing an .mylang file and it prints a text that is between " " after print keyword.
But I'm running a c program to do this like that.
./mylang test.mylang
Is it considered compiler, Interpreter or just c program?
Also what is easier to write? Compiler or interpreter? I'm interested in compilers more.

Answer 1

All I know about them are that compiler translates a file to another file which could be executed and interpreter tranlate the file line by line and execute it line by line

Answer 2

A compiler written in c couldn't translate .mylang files to .c and then run c compiler?