Mayonnaise is an item which definitely needs a kosher certification. You can't tell if it's kosher by reading the ingredients. The same symbol which will tell us that it is kosher will tell us if it is parve or dairy. Generally, if there is no dairy mark next to the symbol it is assumed to be parve.

I encourage you to watch all of our video classes - you will find them useful. Also, our book "Kosher for The Clueless But Curious" will be very helpful.