According to wikipedia, "copy and paste function is related to commands that offer a user-interface interprocess communication technique for transferring date in human-computer interaction. " This interaction technique has close associations with related techniques in graphical user interfaces that use pointing devices such as a computer mouse. This function help people work more efficiently and save a lot of time for human.
How does it work?
In a PC, there is a "clipboard" where it stores copied objects. Because the clipboard is controlled by the operating system, people can copy and paste text between applications. The copy command creates a duplicate and the data will be kept in the clipboard and later inserted in the position where the paste command is issued. Not only can people can copy and paste text, but they are able to copy and paste images and even actual files. In addition, the clipboard supports different formats, so when people copy text it might be saved as multiple copies. For instance, it might have one copy that's plain text and one that's formatted text and when people paste, the application will choose to paste the text format which people want to paste.
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Writing reference:
https://www.quora.com/How-does-text-Copy-and-Paste-operation-actually-work-on-Windows-OS-or-Ubuntu
https://www.quora.com/How-does-copy-and-paste-work
https://en.wikipedia.org/wiki/Cut,_copy,_and_paste
Picture reference:
http://copypasteproducts.com/wp-content/uploads/2015/05/Copy-Paste.jpg
http://gamedevwithoutacause.com/wp-
content/uploads/2012/08/0800_copy_paste_babies.jpeg
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