Contrary to popular belief, Lorem Ipsum is not simply random text. It has roots in a piece of classical Latin literature from 45 BC, making it over 2000 years old. Richard McClintock, a Latin professor at Hampden-Sydney College in Virginia, looked up one of the more obscure Latin words, consectetur, from a Lorem Ipsum passage, and going through the cites of the word in classical literature, discovered the undoubtable source. Lorem Ipsum comes from sections 1.10.32 and 1.10.33 of “de Finibus Bonorum et Malorum” (The Extremes of Good and Evil) by Cicero, written in 45 BC. This book is a treatise on the theory of ethics, very popular during the Renaissance. The first line of Lorem Ipsum, “Lorem ipsum dolor sit amet..”, comes from a line in section 1.10.32.
Web people use it because it has a pleasing appearance while filling out a page for them and their clients to see font style and size as well as the web site’s new design.
Web people also prefer it because the text doesn’t get in the way of the vision. What I mean is that when you show a client a site WITH real text they sometimes jump the track and start fixating on the wording that what they did. This is similar to showing a home for sale and the prospective buyer looking at the color of the drapes and not getting past it when the real parts of the house are exactly what they want.
I just googled “What is ipsumm lorem” and got here. Great answer