Web Technology II builds upon foundational client-side skills by shifting focus to server-side development and the integration of dynamic data. It covers the implementation of robust back-end logic using languages like PHP, Node.js, or Python, along with database management via SQL to create interactive, data-driven applications. Key topics often include session management, security protocols (such as authentication and encryption), and the development of RESTful APIs to facilitate communication between the front-end and the server.