In very basic non tech’ jargon...
1) The Clipboard is not a distinct “thing” that you access; there isn’t a corresponding App per-se. When you select and copy something, the “copied something” is kept in a temporary area of memory until it is pasted elsewhere.
2) If you are not intending to copy and paste “something” as an action, but instead want to keep a copy of the “something” for later reference, then you’ll have to paste it into a document so that it isn’t lost. The Notepad App is an example of somewhere that you could paste the “something”.
Be aware that if you copy something to the clipboard (lets call it “Jack”) and then copy something else (lets call this “Jill”) without first pasting Jack someplace, then Jill will replace Jack on the clipboard (i.e., Jack is lost).
Does this help?