Art is the transmission of emotions, ideas. It aims to stimulate the senses, our mind and new ideas. Defining its boundaries is not possible, they change in accordance with the artist and his visions. It forms an essential aspect of a nation’s culture, and as such, it is unique with it.
It is very important for you to understand how to understand art, to understand how and why there are differences in art, why styles and directions change. This uniqueness with culture is key to understanding the essence of art.
The quality art work is directly dependent on the impression it leaves on people and the emotions it evokes in them. Well, that's real art.