The chapter went on to describe how to make an Ajax-assisted autosuggest control that enables you to display suggestions based on what the user has typed. This control works similar to the way that Google Suggest does and takes into account user interaction with the mouse and keyboard as well as providing for fast typists. This control helped to illustrate the power of simple Ajax solutions.
The next chapter will expand on what you've learned here to create reusable Ajax widgets for your web site. These widgets can use a variety of data transmission formats, including JSON.