Gathering information from multiple web sites, typically via RSS. Aggregation lets web sites remix the information from multiple web sites, for example by republishing all the news related to a particular keyword.

The method of sending data to and from the web server that eliminates the need to re-transmit data for the whole page, and allows for "refreshless browsing". This is the concept around which AJAX and its derivatives revolve.

Application Programming Interfaces; pieces of code which can be included in blogs, websites, etc.

Originally short for "weblog", a blog is just a web page that contains entries in reverse chronological order, with the most recent entry on top. But blogging has taken off because the explosion in blogging software and services -- like Blogger, TypePad and WordPress -- has turned blogging into one of the easiest ways for people to maintain a constantly updated web presence. In addition to the classic text blog, we now have photo blogs (consisting of uploaded photos), audio blogs ( a.k.a. "podcasts") and video blogs (which consist of regularly uploaded video files).

A list of recommended sites that appears in the sidebar of a blog. These sites are typically sites that are either on similar topics, sites that the blogger reads regularly, or sites that belong to the blogger's friends or colleagues. The term "blogroll" also evokes the concept of political logrolling (when legislators promise to vote for one another's pet bills) -- which is not unlike bloggers' habit of reciprocating links by posting links to blogs that link back to their own blogs.

refer to projects where written works are created by multiple people together (collaboratively) rather than individually

describes the collective cooperation, attention and trust by people who network and pool their money together, usually via the Internet, in order to support efforts initiated by other people or organizations.

is a neologism for a business model that depends on work being done outside the traditional company walls which relies on a combination of volunteers and low-paid amateurs who use their spare time to create content, solve problems, or even do corporate R&D

A means of classifying and categorizing data on the web through collaborative efforts from the online community. This is more commonly known as (though not strictly synonymous to) 'tagging'.

The compounding ("mashing") of two or more pieces of complementing web functionalities to create a powerful web application. This is usually achieved through the use of APIs. A web service or software tool that combines two or more tools to create a whole new service.

'is being used as a more general term indicating content that conveys one primary idea or concept, is accessible through a single definitive URL or permalink, and is appropriately written and formatted for presentation in email clients, web browsers, or on handheld devices as needed.' (Anil Dash)

Short for mobile blogging, moblogging refers to posting blog updates from a cell phone, camera phone or pda (personal digital assistant). Mobloggers may update their web sites more frequently than other bloggers, because they don't have to be at their computers in order to post.

A newsreader gathers the news from multiple blogs or news sites via RSS (see below), allowing readers to access all their news from a single web site or program. Online newsreaders (like Bloglines, Pluck, or Newsgator) are web sites that let you read RSS feeds from within your web browser. Desktop newsreaders download the news to your computer, and let you read your news inside a dedicated software program.

refers to any computer software whose source code is available under a license that permits users to study, change, and improve the software, and to redistribute it in modified or unmodified form. It is often developed in a public, collaborative manner and is prime example of user-generated content.

An audio blog, typically updated weekly or daily. You don't have to have an ipod to listen to a podcast; although you can download podcasts to an ipod, you can also listen to podcasts on a desktop computer, or many other mp3 players.

A format for storing online information in a way that makes that information readable by lots of different kinds of software. Many blogs and web sites feature RSS feeds: a constantly updated version of the site's latest content, in a form that can be read by a newsreader or aggregator.

Application framework developed by 37Signals that allows for the rapid development of MySQL –based applications. Could be the most important language in the development of Web 2.0 applications, a logical progression from PHP and a good first step for programmers.

Refining search using techniques like pattern recognition, adaptive filtering, community driven search etc. inorder to get more relevant search results.

An adjective that web designers and developers keep in mind when creating web applications and experiences that are SEO-friendly, easily maintainable, and standards-compliant. Commonly found inside the semantic bowl of alphabet soup are xHTML, CSS, XML, and RDF.

he collaborative equivalent of storing favorites or bookmarks within a web browser, social bookmarking services (like del.icio.us or Furl) let people store their favourite web sites online. Social bookmarking services also let people share their favourite web sites with other people, making them a great way to discover new sites or colleagues who share your interests.

Social networking sites help people discover new friends or colleagues by illuminating shared interests, related skills, or a common geographic location. Leading examples include Friendster, LinkedIn, and 43people.

enables people to rendezvous, connect or collaborate through computer-mediated communication.

A concept initiated by Creative Commons that builds upon traditional copyright practices and relaxes restrictions to promote creative freedom. CC licenses aim at maintaining the balance between an end-user's free use and an author's Intellectual Property Rights.

Making information on a website available (preferrably in digest form) for a wide range of uses, prime examples of which are RSS and Atom feeds. Syndication is a great way of making news updates, blog entries and podcasts immediately available to a Web audience.

Keywords that describe the content of a web site, bookmark, photo or blog post. You can assign multiple tags to the same online resource, and different people can assign different tags to the same resource. Tag-enabled web services include social bookmarking sites (like del.icio.us), photo sharing sites (like Flickr) and blog tracking sites (like Technorati). Tags provide a useful way of organizing, retrieving and discovering information.

Taxonomy is the practice and science of classification.

A special kind of link that joins an original piece of content with derivative works, or new pieces of content that refer to, or were inspired by, the original. This is most commonly found on blogs.

refers to various kinds of media content that is produced or primarily influenced by end-users; as opposed to traditional media producers, licensed broadcasters, and production companies.

A collaboratively edited web page. The best known example is wikipedia, an encyclopedia that anyone in the world can help to write or update. Wikis are frequently used to allow people to write a document together, or to share reference material that lets colleagues or even members of the public contribute content.