O’Reilly’s “What Is…” Page
O’Reilly, the publisher of books and websites about technology, offers a What Is… page of links explaining several technologies:
Welcome to the O’Reilly Network What Is site – the dedicated home to all of our “What Is XYZ” articles. The “What Is XYZ” article is part of a new series we’ve started across all of our O’Reilly Network websites. Our goal is to answer this question for a number of technologies – the killer apps and hot new technologies of today, as well as the tried-and-true, foundational technologies – with high-level overviews.