Bit Masking Help

[khatus]

To mask certain bits we must AND with them___________.
What will be the correct answer?
I think we must AND with them with 0's.

 

[danadakk]

What is bit masking?

I am fairly new to C programming, and I encountered bit masking. What is the general concept and function of bit masking? Examples are much appreciated.

stackoverflow.com

 

[andre_luis]

To mask certain bits we must AND with them___________.

We can mask bits to just let them pass or to cut them off.
A general answer deserves a general reply.