Shisha Sidre Mishna - Shas
The Mishna was composed by Rabbi Yehuda Hanasi, often called Rebbi, as a means of making sure that the Torah SheBaal Peh (Oral Torah) would not be lost.
The Mishna is made up of six Sedarim (Orders): Zra'im (Seeds), Mo'ed (Holiday), Nashim (Women), Kodshim (Holy things), and Tehorot (Impurity). Each Seder deals with an overall topic, e.g.: Zra'im, meaning seeds, deals with topics pertaining to the land.