The document discusses the large and growing field of web development. It estimates there are around 18.5 million software developers worldwide, including 11 million professionals and 7.5 million hobbyists. While this number seems large, the demand for new software development jobs each year outstrips the number of computer science graduates, leading to high salaries and demand for web developers. The document encourages the reader to consider a career in web development and provides an overview of front-end and back-end development roles as well as free learning resources for getting started.