What is Didactics?

 

I think that more than an Art is the science of teaching profession,because it has connection with society and education decisions. 
You also involves Psychology,Sociology and many others activities that helps with education during a class and the interaction between student-teacher and viceversa. 
Another important point is, sometimes we need a guideline to a  improve our knowledge, so this kind of subject will help us to underestand more about it.