As both writers and speakers often cite quotes from noted individuals or historic moments, famous quotes is a popular internet tag.
Quotes, short for "quotations," are the use of words first said by another person. Famous quotes are quotes considered notable because of who said or wrote the statement, where and when it was made, its source, or any combination of those. They can are often used to illustrate or support a point or position.
There is a long history of compiling famous quotes. Today, numerous web sites and blogs are sources for quotes on anywhere from one topic to interrelated subjects to an entire range of topics.