SRadke,
Freemasonry is the worlds oldest and largest fraternity. There are only 2 requirements for being a Mason - members must be male, and may not be atheists. Consequently there are millions of Masons worldwide from all walks of life - Christians, Jews, Deists, Muslims; American, Arab, Chinese, you name it.
The basic structure of Masonry is organized around the "Blue Lodge", which is the local Masonic lodge most small town Americans are familiar with. Members meet regularly at the lodge to conduct lodge business, instruct new candidates, and practice the various ceremonies that are involved. There are three degrees that members pass through - Entered Apprentice, Fellowcraft, and finally Master Mason. As the names indicate, Freemasonry is based symbolically around the ancient craft guilds of actual working Masons.
Passing through the levels enroute to Master Mason has traditionally required a significant amount of dedication and effort for the candidate in order to learn a sizeable amount of information relating to the philosophical underpinnings of the lodge and the degrees. In recent years many jurisdictions have begun cutting back on such requirements in an effort to reach out to the modern generation and stimulate growth in membership - people don't exactly beat down an organization's door nowadays to get in if there is work or thought involved
The highest degree in Masonry that a man can attain is the rank of Master Mason, although many appendant bodies do exist which offer higher degrees (e. g. , Scottish Rite and the 32nd / 33rd degrees) that are not officially part of the blue lodge dogma. The traditional lodges are pretty formal, so some of the appendant bodies were formed to provide a recreational aspect to Masonry - for example the Shrine is sometimes referred to as the "playground of Masonry". That's true to an extent, but far from the whole picture
Lodges are organized by charter from a central Grand Lodge in each state. Each lodge has a slate of officers that changes yearly, with the top position being the lodge Master, aka the Worshipful Master (WM). The Grand lodge has an identical structure of officers, with the top position being Grand Master.
It is impractical for the Grand Master in a state like Texas to be able to monitor all the goings on in thousands of lodges under his jurisdiction, so they have the state broken into districts and in each district a representative is named to act on behalf of the Grand Master. These gentlemen, designated District Deputy Grand Masters (DDGM), do a vast amount of legwork for the Grand Lodge. They also name District Instructors who have demonstrated proficiency in the
entire body of lodge work - a huge amount of information that has been learned by heart, word for word, passed down from man to man over many many years.
It takes a pretty good man to receive the backing of his peers in such a fraternity to rise to the Grand Lodge level, and a smart and hard-working one to boot. That post of Bill Lins speaks volumes, he has put in the time to serve in multiple lodges, be an instructor, and serve the Grand Lodge to boot. Whew!
Hope this info helped explain things a bit... .