Noob question Why there is a dns ( 192 168 * * ) with my google dns that is my router using? And the most important point, Is it safe to use?

If someone attacked my network would my dns ( 192 168 * * ) be a privacy concern?

Noob quetsion Why there is a dns ( 192 168 * * ) with my google dns that my router is using? And the most important point, Is it safe to use?

If someone attacked my network would my dns ( 192 168 * * ) be a privacy concern?