This document provides instructions for compressing and decompressing files using WinZip. It contains 3 activities: 1) Installing WinZip, 2) Compressing a folder into a zip file, and 3) Decompressing a zip file into a folder. The first activity explains how to install WinZip. The second activity demonstrates how to right click a folder, select "Add to Zip" to compress it, and verify the zip file is created. The third activity describes decompressing a zip file by right clicking it and selecting "Extract to Folder" then verifying the extracted files.