Review a view, comparing the knowledge of understanding of the Hadith and principle of understanding of Hadith

There is no doubt that the most important way to access the religious teachings after the Quran is Hadith. Some contemporary scholars have merged between knowledge of understanding of Hadith and its principle. This paper via descriptive – analytical method is going to study and analyze this topic and then clarify the differences between them. However, the differentiation of sciences and clarifying their limitation improves sciences. The paper is explaining the definition, topic, advantages, problems, questions, principles, attitudes, history and lastly distinctions of these sciences.