Difference Whirlpool and Hot Tub

In today's time one reads the terms whirlpool and hot tub everywhere, mostly also coherently, but what do they actually really mean and in what do they differ?

Whirlpool
Behind the term whirlpool stands the so-called circulating "Water Action" for indoors and outdoors. A pool of water in which air is blown in through jets, creating powerful jets of water. A tub (square, round, rectangular etc.) with several nozzles and various outlets for water or also air (air/water nozzles mixed), circulating pump, filter system and much more. With this water bubble bath or even whirlpool named, the water and air jets (massage jets) provide a pleasant, deep massage, on the seats made of acrylic. Accordingly, whirlpools are used for recreation or even medical therapy.

Hot Tub
A hot tub is large barrels or vats filled with water, usually made of oak or cedar. The barrel or vat is thereby fired with wood and thus heated. In some cases, these also offer a bubbling sensation, but without the comfort of the contoured seats of an acrylic whirlpool. Due to the amount of time required (heating up), a hot tub is rather unsuitable and unsanitary for everyday use.