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This animation on the BBC site is a bit old but it illustrates the important elements involved in how web pages get from wherever they're stored to your screen. The 12 simple slides and brief explanations are what you need for part of Task 1. Here's the link - not the picture. http://news.bbc.co.uk/1/hi/technology/8552415.stm

Aim and purpose The aim of this unit is to give learners a knowledge of how websites function and an understanding of their purpose as business tools. Learners will then gain develop the skills required to design and create a multiple page website. Unit introduction The worldwide web has given rise to a new medium of communication. Websites can allow us to ‘walk into’ a world with very few boundaries. We can find MP3 files and download them with ease. Our digital images can be sent to relatives overseas in seconds. We can go shopping without leaving our homes and source the  very best prices with the click of a mouse button. Essential to developing the worldwide web are the people who design effective documents that can be 'read' by a web browser. Web designers have the fascinating task of taking text, images, video and other resources and crafting them into high quality documents for broadcasting across the world via the internet. Their brief is...