This is quite an informative video about eggs, by Dr. Greger of NutritionFacts.org
sorry i am relatively new to vegan. eggs are not part of vegan diet right?
Eggs are obviously healthy but not a part of veganism. I mean many vegetarian people include eggs on their vegan diet. They are called Ovo-vegetarian.
Every one knows that egg is a complete protein food. But what is the use of egg for a vegan?
Did You actually watch the video? 
I changed Who to World Health Organization because the title was misleading.
Eggs are definitely not vegan. Eggs fall under the dairy category with milk and cheese. Animals on dairy farms are subjected to rape, murder and exploitation which goes against what vegans believe in. For the animals.