Is it true that salts or acid preservatives are added to pickles to increase the growth of microbes?

Food preservation refers to the processes and techniques used to keep food from spoiling and to extend its shelf life.  Salt aids in the fermentation process control. A little vinegar can be added to this process for flavor and to prevent the growth of unwanted germs. Oil is a common method for preserving pickles in our country because it reduces the air in pickled items.