More about software
Software only works when it is loaded into your computer's memory.
When software is not in use, it is stored on a hard disk, CD-ROM or floppy disk.
The storage device which holds the most information is the hard disk. This is kept inside the computer beside the processor. It is used for storing the operating system and large application software.
Whether your processor is in a box or a tower, there will probably be two slots on the outside:
a long one for taking a CD-ROM like this:
a short one for taking a floppy disk like this:
CD-ROMs are often used for storing software such as games and encyclopaedias. Some are even stored on DVDs, which can be used in the most recent IT systems.
Floppy disks store small amounts of information. They can be used to store your personal work and to transfer files to another computer, perhaps at home.