Hard Disk is the main part of a computer either it is HDD or SSD. It is the permanent storage device used in any computer. Health of hard disk goes down with time. Hard disk health goes down in a high speed if it is used in a wrong way.
Now-a-days internet is widely used internationally. While surfing over internet, search history is automatically saved in browser. In some cases its required that search history should not be automatically saved. This can be achieved by using Private Browsing .