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Definition of Didactics:
There are different definitions of Didactics, some of them are:(by different authors).

Claparède understands the Didactics as: " Methodology of the education ”

For Aebli, it is: " An auxiliary science of the Pedagogics in which this one delegates for his achievement in detail of more general educational tasks: The scientific Didactics is deduced of the knowledge of the processes of intellectual formation and of the most suitable methodological skills. ”

Mattos: " Pedagogic discipline of practical and normative character that takes the skill of the education as a specific object, this is, the skill of directing and facing effectively the pupils in his learning. ”

Stöcker: " Theory of the instruction and of the school education of any nature and in all the levels. It treats of the beginning, phenomena, forms, prescripts and laws of any education. ”

Fernández Garden: " The Didactics takes as an object the normative decisions that lead to learning thanks to the help of the methods of education. ”
And there are more, but these are some definitions by these authors.

We can define  the Didactics as the science or the art of the education.
it is a science which study centres on the education, in the process of education - learning.

Domain:
 is inside the general frame of the Sciences of the Education.

Historically the Didactics has dealt with two activities: to learn and to teach and has realized them from four dimensions:

The regulation,The technological one,The aplicativa or of intervention and The interpretive one or the explanatory one.

Fields where Didactics gets involved:
Psychology, the Sociology or the Cultural Anthropology.
The Didactics manages to come to his plenitude when the human being to which it goes manages to integrate learnings by means of cultural processes being capable of generating new responses with them.