There are many approaches to eating a vegetarian diet.
A general vegetarian diet normally excludes meat, fish and poultry but may or may not include eggs and dairy foods – like milk, cheese, and yogurt.
Lacto-ovo-vegetarians always include eggs and dairy foods.
Lacto-vegetarians exclude eggs but use dairy foods. Ovo-vegetarians eat eggs but not dairy foods.
Pesco-vegetarians include fish and may or may not include eggs and dairy.
As you can see, choosing a vegetarian eating plan can be very individualized. Some even consider themselves semi-vegetarians. Meaning they eat vegetarian meals most of the time but will, on occasion, as often as a few days a week, eat animal foods. Vegans, on the other hand, are the strictest. They exclude all animal foods, eggs and dairy and often exclude honey as an animal food as well.