Lacto-ovo vegetarianism is a special kind of diet where a person only eats food that comes from plants, but they're allowed to consume eggs and dairy products (like cheese, milk, and yogurt), too. This means that they don't eat meat or fish, or any other kind of animal flesh.
Imagine you're eating a plate of food. You know how sometimes there's a piece of steak or chicken there? Well, lacto-ovo vegetarians don't eat those things. But they can eat things like salads, fruits, and vegetables. They can also eat things like omelets or scrambled eggs for breakfast. They can even have pizza with cheese on it, cheese sandwiches, and grilled cheese sandwiches, because cheese comes from milk, which is not from an animal's flesh.
Lacto-ovo vegetarianism is a choice that some people make because they care about animals and want to protect them. Eating this way can also be healthier because plants have lots of vitamins and minerals our bodies need to grow and be strong.