In the world of so-called PC cleaning, CCleaner is one of the most popular applications out there. It can delete temporary files, "clean" your registry, and can also clear files associated with your web browser like Microsoft Edge or Google Chrome. There's one downside though: it's a proprietary application that has suffered a pretty severe breach in the past, which is why many people eventually switched to the open-source and free BleachBit. However, you shouldn't use either application, especially if you're using a modern computer with a modern operating system like Windows 11.