Transitional or Social Vegetarian
Making the decision to become a vegetarian can be tough. Some people make the transition into becoming a vegetarian by slowly cutting out certain animal products, one at a time. Others support vegetarianism by not eating meat when they are eating with vegetarian friends. Some occasional vegetarians aren't comfortable eating or preparing meat at home, but don't mind ordering it in a restaurant, where someone else is doing the dirty work.

Ovo-Lacto Vegetarian
The word "ovo" comes from the Latin word for egg. If you are an Ovo vegetarian, you won't eat red meat, poultry, fish or dairy products, but don't mind eggs. The word "lacto" comes from the Greek word for milk. Lacto vegetarians eat dairy products, but not red meat, poultry, fish or eggs. Those who are comfortable eating eggs and dairy products are called Ovo-Lacto vegetarians.

Pescatarian
Pescatarians eat fish. Sometimes they can be ovo-lacto vegetarians too. Beef and poultry are still off limits, though.

Macrobiotic Vegetarian
People who are macrobiotic vegetarians eliminate all processed foods from their diet, like flour and artificial sweeteners.

Vegan
Vegans don't eat anything that comes from an animal. Like the strictest vegetarians, they don't eat red meat, poultry, fish, eggs or dairy. Vegans take the decision not to buy or use animal products a step further by not eating honey or wearing clothes made of material that comes from animals, like silk, leather or wool. Veganism is the type of animal-friendly lifestyle that is considered the most politically driven. Even though you don't have to harm a sheep to gather its wool, vegans won't buy this sort of product because they are against the mistreatment and/or exploitation of animals for human benefit.

Fruitarian
The most radical of animal-friendly dieters, fruitarians only eat food that a person can gather from a plant without killing it. Some examples of fruitarian goodies are fruits, vegetables, nuts and seeds.

Raw
A raw diet takes a fruitarian diet one step further by keeping all food uncooked and unprocessed. This diet is based on the idea that food in its natural state (aka, uncooked) is what is healthiest for the body in terms of digestion and absorption of vitamins and minerals. For example, a raw "pie" would have the piecrust made out of crushed nuts and pie filling made of uncooked fruit. Raw food (which includes many fruit and veggie juices, nuts and seeds) are also known as "living" foods.