One definition is;
A peculiar system of morality, veiled in allegory and illustrated by symbols.
In reality, Freemasonry is a society that seeks to promote decency, honesty, respect, and understanding. It aims to “make good men better” and to raise money for charities and good causes.
Groups, known as Lodges, meet on a regular basis throughout the year and perform what are (somewhat archaically) known as rituals. These are very much like plays with different people playing different parts. Each person has a set of lines to speak and actions to perform. A formal Lodge meeting may last 2 hours or more.
During these meetings, younger Masons get to learn about the craft and understand the importance of being a person of good character. Although the rituals were devised hundreds of years ago, they are still as true and pertinent today as they have always been.