To create a .ZIP file in Mac OS X:

  The .zip file cannot contain any sub-directories, it should include only individual files.

  • First select all of the files you want to add
    • you can select multiple files by holding down the command key (apple key) on your keyboard and clicking on each file you would like to select

  • CTRL-click on the selected files then select Compress Items
    • earlier versions of OS X will instead have a Create Archive option

  • OS X will then create an file like the one below