When working with zip files Mac and PC users have different options. Learn how to use zip files in Windows 10 and on a Mac here.
Windows treats zip files just like folders. You can open a zip file, move files in and out of it, and open individual files just like you would if they were in a folder.
Because Windows makes it easy to work with zip files, there's generally no need to unzip them. However, if you would prefer to unzip them you can simply right-click the zip file's icon and select Extract All.
Opening a zip file in OS X is slightly different from Windows. Instead of opening the zip file directly, it will unzip the files and place them in a new folder. You can then open the folder to access individual files.