"The Ancient and Accepted Scottish Rite of Freemasonry (the Northern Masonic Jurisdiction in the United States often omits the and, while the English Constitution in the United Kingdom omits the Scottish), commonly known as simply the Scottish Rite (or, in England and Australia, as the Rose Croix although this is only one of its degrees), is one of several Rites of Freemasonry. A Rite is a progressive series of degrees conferred by various Masonic organizations or bodies, each of which operates under the control of its own central authority. In the Scottish Rite the central authority is called a Supreme Council.
The Scottish Rite is one of the appendant bodies of Freemasonry that a Master Mason may join for further exposure to the principles of Freemasonry. It is also concordant, in that some of its degrees relate to the degrees of Symbolic (Craft) Freemasonry. In England and some other countries, while the Scottish Rite is not accorded official recognition by the Grand Lodge, only a recognised Freemason may join and there is no prohibition against his doing so. In the United States, however, the Scottish Rite is officially recognized by Grand Lodges as an extension of the degrees of Freemasonry. The Scottish Rite builds upon the ethical teachings and philosophy offered in the Craft (or Blue) Lodge, through dramatic presentation of the individual degrees."
To find out more, visit the official page of the Scottish Rite, Southern Jurisdiction at https://scottishrite.org/