Antibiotics Kill Bacteria ( bith Good as well as Bad, so it is recommended to avoid antibiotics. But if in case you have to take that then after that take a good dose of Probiotics in order to regain your normal flora).
Antifungals kills fungi such as Yeast But it is very difficult to get rid of yeast infection without proper diet and Hygiene.
In order to kill Yeast, you need Antifungals
No. Yeast is a fungus. Antibiotics kill bacteria.