Final answer:
An oven is called an oven because it uses convection to transfer heat from the fire to the food. Conventional ovens rely on hot air rising to circulate the heat, while convection ovens use fans to circulate hot air more evenly.
Step-by-step explanation:
Convection is heat transfer by the motion of matter that rises because it is hot and less dense. An oven is a great example of this: the fire at the bottom of the oven heats the air, causing it to expand and rise. The rising hot air carries the heat from the fire to the food by convection. This is how conventional ovens work.
Convection ovens, on the other hand, use a fan to circulate hot air for more even cooking. However, technically, ovens that use fans to help move heat are called 'advection' ovens. Normal non-fan ovens that rely on hot air rising to circulate the heat are convection ovens.