Hard drive partitions...who needs such a thing? Well, before anything else, I must say what a partition is, when talking about computer engineering, since I don't care about the math-related terms or other uses of this word. 

Think about a partition as a slice of a pie. Why would one slice a pie? Usually, one of the reasons would be "to eat it easier". Hard disk drive partitioning is used to create logical divisions on that drive, allowing logical formatting that depends on the operating system and the file system(s) you want to use. 

There are a lot of reasons to partition your hard drive, and even if you don't want to have three Windows versions and five Linux distros installed on your computer, there are two solid reasons about it. 

Better organization on your hard drive leads to improved speed and reliability, and there are two problems that can be solved here, as I was saying earlier, and both are related to file fragmentation. 

The first problem to take down is swap file fragmentation, and the solution is to create a swap partition close to the beginning of your hard drive (first partition will have the OS installed on it and the second must be the swap one, since access time increases as you're heading towards the physical end of your drive) and place on it a fixed-size swap file as large as possible (usual recommendations are to make it two and half times the size of your system's memory).

The second problem that comes as a natural consequence to the first one is the need to keep your boot (system) partition as clean as possible, so a good idea is to create a new slice for installing programs, and the game goes on from here, but I am sure you got the idea.

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