Answer:
Compatibility.
Explanation:
Email or electronic mail is a messaging system that allows for transmission of digital or electronic mails to computers within and to other networks through the internet.
Email applications are web based applications and are hosted on servers. The POP (post office protocol) and IMAP (internet messaging access protocol) are used to message the mails sent to a client on a server. The application is written with standards and protocols to ensure compatibility in all types of device form factor, so an email can be view in a laptops, smartphones etc.
If it is on the desktop screen you just right click on the icon and select delete. from there if you're on a windows computer it goes to your recycle bin then you right click the recycle bin and a little rectangle pops up an in that rectangle it says clear recycle bin and once you press that all of the stuff that was in there is deleted. now if your on a computer that has chrome os installed you just go to the files screen and right click what you want to delete and click delete and it's gone.