A priori and a posteriori judgment

Judgments a priori 
judgments a priori are based on pure reason are necessary and universal .existen synthetic judgments a priori that make reference to the phenomena, and analytical judgments that do not give new information.The judgments are a priori possible in mathematics and in the rational part of physics but not in metaphysics


Judgment a posteriori

These judgments are based on facts, experiences are empirical these judgments are individuals and contributors and above all give information are precisely based on the information rather than explain.

When a judgment  is universal and necessary is not to say that all people should know that is true, or that they necessarily have to make that judgment