During this week's lesson, I have learnt about CSS, which is Cascading Style Sheets. CSS is used to add detail to html documents and is therefore an extremely useful tool when creating websites and other internet related content. CSS works by first creating a notepad document with all the elements which you wish to have in the document or part of the document in the HTML notepad file; then you link the HTML file to the CSS file and the effects in the CSS file will be in the HTML file. So long as the CSS file is on the same level as the HTML file, it will be linked. Therefore CSS is useful as you do not have to copy and paste large chunks of HTML to design different parts of a website, but you can just link it all to one CSS document and it will all be designed.