What does “Drag and Drop” Mean?

What do you mean by “Drag and drop”?

When you click on a file or icon image and continue to hold your finger on the mouse button the file will move as you move the mouse. Once you let go, the icon will Drop to where you were.  If you hover it over a folder icon, the icon will light up or change in some way, and when you “drop” the mouse button the icon will disappear “into” the folder.