In this section, you’re going to learn just what a web page is and how it can be read by a browser like Internet Explorer or Firefox. You’ll also construct your very first web page. Let’s make a start.
Files on your computer come with extensions. If you wrote a letter using Microsoft Word and saved it with the name ‘MyLetter’, the software would add four letters to the file name (three in older versions). Because it was typed using Word, the four letters that get added to your filename are .docx. So your file name will be ‘MyLetter.docx’ and not just ‘MyLetter’. If you created a spreadsheet in Microsoft Excel and called it ‘Accounts’ the Excel software will add its own four letter extension to your file name. It will add .xlsx. So you file name will be ‘Accounts.xlsx’ and not just ‘Accounts’. So you get a different four letter extension depending on the software you used.
These extensions are very important to computers. They are used to identify the type of file it is. With a file extension, Word can recognise its own documents. It sees the letters docx and says ‘Ah yes, that’s one of mine. I can open it.’ If it sees a different extension, xlsx for example, it says ‘What the heck is that?’ You may then get an error message telling you that the file type is not recognised.
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