Absolute Paths is a way to write URLs, to tell exactly where a resource on the Internet is placed.
To save bandwidth, its often best to use root-relative paths. Brugbart uses Absolute Paths, but this is only to avoid broken links, if someone where to save a local copy of resources, or if they where to steal, or otherwise show a copy on their own website.
For the most part however, you might want to stick to using root relative paths.
Absolute Paths Example
To write an absolute path, you would simply want to do something like below when typing links. An absolute path to this page would look like the below.