SPServices is a widely used jQuery library that abstracts SharePoint's Web Services and makes them easier to use. It also includes functions that use the various Web Service operations to provide more useful (and cool) capabilities. It works entirely on the client and requires no server install.
Using SharePoint’s Web Services client-side, you can provide your users a more “tactile” experience.
In this class, you'll learn how to use SPServices to build a more compelling user experience on top of SharePoint. We'll look at the most popular ""value-added"" SPServices functions as well as how you can use SPServices as part of your own development toolkit. We’ll also discuss how you should think about migrating from SPServices to REST calls and when it makes sense.