Many times you will receive an Email with an attachment or you download a file that you can't open because it is a ZIP File. Well download and install this program and like I always say, you learn better by doing. You will need to learn how this works. Basically a ZIP file is like taking 12 folders and putting them in a brief case for easy travel. In this case you are taking 12 files or folders you have on your pc and making ONE ZIP file that contains all 12 items. This will also condense the size to help, when it comes to Emailing larger files. Click on this link and it will take you automatically to the download section. When you click on it a window will pop up and ask you to OPEN or SAVE. Click SAVE, download and install this program. Ciao!