Drop

Drop refers to downward motion of each tetromino in Tetris games and other games that use falling pieces.

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Soft drop

Many games allow the player to temporarily increase the gravity by holding down a key, most often Down on the directional pad or joystick. A tetromino under soft drop (sometimes called fast drop) generally falls at around 20 to 60 blocks per second, as fast as or faster than DAS. The first few generations of games on consoles had only soft drop, not hard drop. Most games will lock a soft-dropped piece as soon as it lands; others (especially SRS based) apply the same lock delay used for gravity.

ARS uses locking soft drop.

SRS uses non-locking soft drop.

Hard drop

Hard drop refers to forcing the gravity to 20G for one frame so that the piece lands instantly. Quite a few early PC games had only hard drop and no soft drop.

Some people use the term hard drop or sonic lock to refer to the more common version of this move that locks instantly, as opposed to firm drop or sonic drop for the less common version that has a lock delay (as seen in The New Tetris and games with TGM rotation after the original TGM). The "firm drop" also allows for Zangi-moves with a quick rotation of the joystick.

A hard drop, or sonic lock

A sonic drop and one of its practical usage