Shift key , we know, used most often for caps lock.

click

“Since Shift is a modifier key, it can also be used in conjunction with the mouse.. For example, many programs will allow you to select more than one item by holding down the Shift key and clicking multiple items on the screen. It can also be used to select a section of text by clicking in one spot, holding Shift, then clicking in another spot. Finally, Shift is sometimes used for keyboard shortcutsthat perform common commands. For example, Control+S is the standard “Save” shortcut, while “Control+Shift+S” is typically used for “Save As…”