At some point it becomes useful to classify the information according to categories. For instance, you might want to add an article on acute MI to the category of cardiology. Acute MI would then be included with all the other articles related to the subject of cardiology in this category. All the articles in a category can come together to forming a living textbook of a given topic. Categories are also used to list all the articles that need work for instance, like the addition of an overview statement.
Why put an article in a category?
At some point it becomes useful to classify the information according to categories. For instance, you might want to add an article on acute MI to the category of cardiology. {{ORGANIZATION}} would then be included with all the other articles related to the subject of cardiology in this category. All the articles in a category can come together to forming a living textbook of a given topic. Categories are also used to list all the articles that need work for instance, like the addition of an overview statement.