You may have already heard about CCleaner, this famous tool for cleaning your Windows PC. This one, known as CCleaner Portable is a portable version of that tool and with which you do not need any installation.
Portable: one of the main advantages of having a portable version of a software is that you do not need any installation to run the application. You can have it in your USB sticks and other flash memory drives and can run it on any computer without installation and at any teim. Having a portable version of CCleaner is a big plus.
Cleaner section: first of all, the software is going to clean unnecessary system files (Memory, Recycle Bin, Cache, Windows Explorer, etc.) and then, will remove leftovers that may be installed on the computer hard disk.
Other extra functionalities: the software also allows to remove installed software and to startup some utilities. It is possible to keep some cookies that you may need and for that you have to establish a filter.
This portable one includes all the functions of the standard version.
Optimizes the speed of Windows and gives more space on the hard disk drive.