RSS feed
An RSS is a function that allows you to quickly find out if a site has been updated with new content. If it has you can then see that new content. This tool is very helpful to someone who spends a lot of time reading bloggs or getting podcasts. However, there are some problems with the RSS, there are several versions of RSS and as a result you may not be able to get certain feeds due to incapability. However the RSS is still a very powerful tool.