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The shift key is a modifier key on a computer keyboard used to type uppercase letters and access the alternate "upper" symbol or character on a key. It can be used for temporary capitalization by holding it down while pressing a letter, or to execute shortcuts and other functions by holding it down in combination with other keys, such as for text selection or permanent shortcuts like Shift + Delete to permanently delete a file.

Functions of the shift key

Typing:

Capitalization: Holding the shift key while pressing a letter produces an uppercase character (e.g., a becomes A).

Symbols: On number and symbol keys, it produces the alternate character that is typically printed smaller on the key (e.g., 2 becomes @, 9 becomes ().

Shortcuts and other functions:

Text selection: Holding the shift key and pressing an arrow key selects text one character or line at a time.

Shift + Delete: Permanently deletes a file without sending it to the Recycle Bin.

Shift + Restart: In Windows, holding Shift while clicking Restart opens the advanced startup options.

Gaming: It is frequently used in video games as a modifier key to perform actions, notes Lenovo.