You may not know that when you delete files from your hard drive, you're not actually deleting them, but just marking that disc space as available again.
This means that using the appropriate tools, anyone could easily recover your deleted files and therefore threaten your privacy. To ensure this doesn't happen the best option is grabbing hold of a tool like Mareew Free Eraser, an application that enables you to safely delete files by overwriting them a few times and thus making them harder, if not impossible to recover.
While the idea behind Mareew is certainly good, I found the program lacks the most basic options. It's great to have such an easy-to-use tool but that doesn't mean it shouldn't include features like the possibility of previewing the files you're about to delete or a delete command being embedded in Windows Explorer's file context menu. Marew Free Eraser doesn't include any settings window where to tweak deleting options.
Mareew offers a safer way to delete confidential data, but lacks many basic features found in other similar applications.