An aggregatorcommonly known as a feed reader, RSS reader or news reader is a software program (such as iTunes) which is installed on your computer or a Web application (such as Bloglines) which aggregates or “pulls in” syndicated web content such as news headlines, blogs, and podcasts in a single location for easy viewing.
The syndicated content an aggregator will retrieve and interpret is usually supplied in the form of RSS or other XML-formatted data, such as RDF/XML or Atom.
News Sites as aggregators
Some websites such as Digg, Reddit, Stumbleupon and Yahoo Buzz which allow users to rate and submit articles function as a news aggregator site because they contain much user submitted data.
Social Media Aggregators
Some web applications such a friendfeed function as a social media aggregator. It allows you to access all of your aocial media sites from on e place.
A podcast is a way to broadcast multimedia files—audio or video—over the Internet for playback on mobile devices (ex. MP3 players) and personal computers. Podcasting lets the podcaster create a broadcast about a subject of interest to him/her and their subscribers. Subscribers simply download the podcast and listen to it at their convenience.
Apple pretty much introduced podcasting when they developed the iPod and and iTunes
File types supported: mp3 or m4a for audio, mov or m4v for video
More information at: http://www.apple.com/itunes/store/podcastsfaq.html
Blogs are one of the more popular technologies of Web 2.0. They have enabled anyone to start publishing and expressing theri ideas on the Web.
“Blog” is an abbreviated version of “weblog,” which is a term used to describe web sites that maintain an ongoing chronicle of information. A blog is a frequently updated, personal website featuring diary-type commentary and links to articles on other Web sites. Blogs range from the personal to the political, and can focus on one narrow subject or a whole range of subjects.
Many blogs focus on a particular topic, such as web design, home staging, sports, or mobile technology. Some are more eclectic, presenting links to all types of other sites. And others are more like personal journals, presenting the author’s daily life and thoughts.
Generally speaking blogs tend to have a few things in common:
- A main content area with articles listed chronologically, newest on top. Often, the articles are organized into categories.
- An archive of older articles.
- A way for people to leave comments about the articles.
- A list of links to other related sites, sometimes called a “blogroll”.
- One or more “feeds” like RSS, Atom or RDF files.
Taken from http://codex.wordpress.org/Introduction_to_Blogging