For a website to be made available on the Internet, it has to be hosted on a web server. This is where web hosting comes in. It's just like renting property. Every website needs a domain name. If you are a business, you ideally need your own domain name. If you are working on a personal homepage, a domain name isn't as important. Some people judge the quality of a website by it's domain name. When choosing a web hosting plan you will find many options for Mb (megabytes) of disk space at various prices. This is just the space required to store your website text, image and database files, web logs and any emails awaiting download. This can be calculated before you chose a hosting plan so that you don't pay for more than you need but still allow sufficient space for short term expansion. Data Transfer is sometimes called Traffic or Bandwidth in hosting plans and in that context means the amount of Mb (megabytes) of data transferred in a month. Data is transferred every time a visitor opens a web page, a file is uploaded to the website, or an email is downloaded. So if your website has high resolution images, videos or flash animations, they increase the megabytes of data transferred. Be aware that your website may have seasonal traffic. e.g. websites selling toys may get more traffic in the Christmas shopping period, so monthly data transfer needs to be high enough to cover November-December traffic. Contact Internet SAVVY in Sydney (Wollongong), Australia for for any additional help in choosing a web hosting plan.