Clipboard acts as a temporary storage for data that you transfer between and within applications. In short, it’s the place where your copied text is stored to enable you to paste it. The clipboard is usually unnamed its contents are stored in the device’s RAM. New “copy” action usually overrides the clipboard’s contents, as you have probably experienced.
This is a companion discussion topic for the original entry at https://henrywithu.com/instant-clipboard-override-on-iphone-for-privacy/