WCAG, stands for Web Content Accessibility Guidelines (WCAG) and is a set of guidelines used by web designers and developers to help improve the accessibility of their web sites to people with disabilities.

The recommendations in the guidlines are divided into 3 different levels of priority. These are, level A, AA and AAA. People sometimes talk about their site being double A or triple A compliant, referring to the extent to which they have implemented the accessibility guidelines.

WCAG is created by the W3 consortium and has been a controversial set of guidelines. On 3 November 2008, WCAG 2.0 became a W3C Proposed Recommendation which is actually a lot more concrete than it sounds.You can view the full text of WCAG 2.0 on the W3 consortium's website.

White space is a page layout term and refers to the areas of a web page that have no text or graphics on them.

Put simply, white space, is the space between stuff.

A typical web page will be made up of headers, text, photographs, videos etc. How much space is left between each of these elements is an important aesthetic decision.

White space isn't worthless or empty. It makes a page readable and useable. Clients often include the word "clean" in a brief, saying that they want their web site to be clean. In many ways, this is achieved by good use of white space.

Where space is at a premium, e.g. where it is related to advertising, a web page can become cluttered.

Of course, the background colour of a web page can be changed or textured, so white space isn't always white, but in this case, the term would still be used.

Wi-Max or Worldwide Interoperability for Microwave Access, is a wireless technology that enables computers and mobile devices to connect to the internet.

It is like the Wi-fi connections that many people have a home or can access in cafes and airports. The main difference from the user's perspective though is that whereas wi-fi has a range which can be measured in 10s of metres, wi-max range is measured in kilometres. Typically Wi-Max networks range from 3-10 kilometres and do not rely on "line of sight".

Wi-Max is based upon the IEEE 802.16 international standard and at present has transfer speeds comparable to domestic ADSL, upwards of  1-5 Mbps.