File types and extensions
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What I'm going to do now is look at file types and extensions. Now, the name of the file would be something like "My Document". The extension would always be a dot and then some letters after it. So if you have done a Word document, it will be mydocuments.doc, so the extension is the part which is dot and then some letters or numbers. So here we look at some examples of some extensions. The first one is a PowerPoint file. Now this PowerPoint file here has an extension ".pptx". Similarly, with the Word document here, this has got "docx". Now you see that the "docx" is actually on the file image here, rather than at the end, it's still showing you exactly that file... What extension type it is. Now this one here is a video file and this extension is ".mov". Very similar to this one on the end here, this is also a video file, a different type and this one is ".mp4".
Now this document here is a PDF document. It's just a form... An instruction leaflet for some software, so we got the name of the file here and then ".pdf". The next one is a Spreadsheet and we were just given this Excel example and this is ".xls" and then the "x" on the end. Remembering that's because this was created on a Mac. And this final one we have got here is a ".zip", this is a compressed file. Often you will get zip files when you have been sent a file over the internet, since maybe someone sent you a document through a file transfer service, you download it and it's a zip file. So what you need to do with those, if you just click on them and they will open up the file into a folder and then you can see your files directly from that folder. The final one we are going to look at are image files. Now there are lots of different types of extensions for an image file, but the most common one is ".jpg". So what you see here is a picture of the Olympic flag and it says "flag.jpg". That would indicate it's an image file. Now there are other types of image files like "PNG", but the main one you are always going to see is the JPEG file.
- EDSQ Unit 1 LO 3.3