What is @echo off

Question

this is a programing language

Answer 1

Assuming you're talking about batch.
@echo off hides the output of commands.

For example, say you have this batch program:
set N=5
echo %N%

If you run it, it outputs:
C:\....>set N=5
C:\....>echo 5
5

Probably not what you want.

If you now add @echo off to the beginning of the program:
@echo off
set N=5
echo %N%

Now it only prints:
5