[bmn__]

These are different equipment.

A kettle is used for heating water. In earlier times, it was made out of metal and put onto a heat source (fire, stovetop). Nowadays it is almost entirely displaced by the electric kettle, which is commonly made out of plastic and contains a metal heating plate or spiral on the inside.

A teapot is a ceramic pitcher where you put the boiling water and tea leaves to brew the tea.

[scott_s]

Earlier-time kettles may be more common than you think.

[war1025]

Either way, a water kettle is super useful, often surprisingly so.

Definitely a kitchen gadget I'd recommend to anyone.