Veganism has been around for a while, but I prefer another term- whole food plant based eating, because it refers to a sustainable, high quality way of eating which has good evidence for longevity. There are so many processed vegan foods around nowadays, that you can eat a high junk, high processed, high convenience food, and high poor quality fat vegan diet, and for this, there are poor outcomes. 

Whole Food Plant Based eating is a term given to eating a diet of mainly plant foods, but it is a high quality diet with foods that mainly look like the original plant i.e. whole foods. It is a way of eating that has plenty of fruits and vegetables, often a large amount of them raw- and wholegrains, legumes, and small amounts of nuts and seeds. Generally it is much lower in overall fat that an omnivorous, or poor quality vegan diet.