With Internet Explorer 4, Microsoft took the Web off-line. The Web browser – and all of its subsequent versions – included an option to save Web pages for off-line viewing, meaning that you could bookmark a long article or interesting page to see even when not connected to the Internet. You can later remove these pages from your PC quite safely using system utilities like Disk Cleanup. Writer Bio

Is It Safe to Erase Off Line Web Pages With Disk Cleanup  - 44