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From Information about Isaak, Brock University's Sakai-Based LMS

In some situations, it is necessary to zip a file into one smaller file in order to conserve space, keep multiple files in one item or accommodate Brock's Sakai-based LMS' 200Mb upload limit.

Occasionally zipping a file is referred to as archiving a file.

[edit] Here is how to zip a file

[edit] On a PC

Select the files then right click them and select "Send To" > "Compressed (zipped) Folder". Windows will then create a zipped archive with file name of the 'first' file.

[edit] On a Mac

Select all of the items then ctrl+click (right click) the files and select "Create Archive of X items". The Same menu can be found under the "actions" cog in the Finder menu.