The Amish are a group of traditionalist Christian church fellowships. They are closely related to, but distinct from, Mennonites. The Amish are known for simple living, plain dress, and reluctance to adopt many conveniences of modern technology. The history of the Amish church began with a schism in Switzerland within a group of Swiss and Alsatian Anabaptists in 1693 led by Jakob Ammann. Those who followed Ammann became known as Amish. In the early 18th century, many Amish and Mennonites immigrated to Pennsylvania. Today, the most traditional descendants of the Amish continue to speak Pennsylvania German, also known as "Pennsylvania Dutch," although a dialect of Swiss German.