The document discusses the differences between frontend and backend development. Frontend development involves the design and visual elements that users interact with, such as graphics, text, and menus. Backend development involves the behind-the-scenes work to ensure the proper functioning of a website, including how data is processed and delivered to users. Frontend is client-side, while backend is server-side. Common frontend languages are HTML, CSS, and JavaScript, whereas backend languages include Java, Ruby, Python and PHP. While distinct, frontend and backend work together and rely on each other to create fully-functional websites.