Eating a plant-based diet does not mean you have to be 100% vegan, but rather that the majority of your food comes from plants. More specifically whole foods and not the processed garbage. Eating plant-based means consuming a lot of fruits, veggies, whole grains, and legumes. The percentage of animal products you consume is completely up to you; I am here to inform you of what they do to your body and what you will have to do to reach your goals. While I would never encourage anyone to keep consuming animal products, I understand that not everyone truly wants to be 100% plant-based. Likewise, people who are plant-based usually are so for health reasons; animal welfare is a nice byproduct though.
A vegan diet excludes any food that is derived from or comes directly from any animal. To name this big ones: meat, fish, poultry, dairy, cheese, butter, eggs, and honey (since it is produced by an animal. Some not so well known ones are: casein, whey, lactose, rennet, gelatin, and glycerides. So, foods like soda, chips, chocolate, and white bread can all technically be vegan. However, there is a BIG difference between “vegan” and “healthy”. Vegans, technically, eat based on ethical concerns which is why you may see a great many unhealthy vegans.