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This chapter explains how information is sent between a browser and a server. It begins with descriptions of the request from a browser and a response from a server. Each has a format that is determined by the Hypertext Transfer Protocol. Basic HTML tags are introduced next, followed by HTML forms for collecting data. Data is easily passed from one page to another, but the data cannot be processed without a dynamic engine like a servlet engine. Maven is introduced as a development environment that easily incorporates a servlet engine into an application. Using Maven, a web server can be started that hosts a web application that can be compiled and run. The chapter explains markup languages, with a detailed description of the Hypertext Markup Language, which sends formatted content from the server to the browser. An important feature of HTML is its ability to easily request additional information from the server through the use of hypertext links. HTML forms are covered. These send data from the browser back to the server. Information from the form must be formatted so that it can be sent over the web. The browser and server handle encoding and decoding the data