Partition

A Partition, put simply, is a segment of a Hard Drive that is self-contained, and seperate from other portions of the drive.
Let's take an 80GB Hard Drive as an example. Usually, a Drive like this will actually have a Formatted Capacity of around 74GB
So, a Partition Table might look like this:
Partition Number	File System	Partition Size
Partition 1 	FAT32 	8GB
Partition 2 	NTFS 	20GB
Partition 3 	Ext3 	20GB
Partition 4 	Ext2 	20GB
Partition 5 	FAT32 	20GB