ZIP

ZIP is a compression algorithm widely used on most of todays operating systems. A ZIP archive can contain multiple files, folders and subfolders. Both SCORM and IMS content packages are actually ZIP files that must contain a valid imsmanifest.xml file on their root level. With MacOS X you can right-mouse-click files or folders in the finder and choose "Create archive of ..." from the context menu. On Windows you have to install a tool like WinZIP to create ZIP archives.