Having multiple partition on any windows system is essential to protect data and other important files in case of any crash or mishappening with windows. We all know that windows is not very stable Operating system and form the beginning it was always advised that you store your data and other important files on a partition other than main windows partition.
Most of new computer comes with single partition to store data as well as windows file, and with the increasing size of hard disk we have lots of file which we store on a single computer, In case your OS crash or become unusable, and you have stored all files on same partition as your OS then you have no option to format the hard disk, which can result in lass of data. To overcome this situation you should make different partitions on your hard drive.
Now if your new computer comes with single partition, still you can make partition using windows inbuilt partition manager, but it has limited features and function. To use it in advanced mode you should use external partition software. Aomei Partition Assistant is one such partition manager with great features. One of the greatest feature is it is compatible with windows 8 as well.