Halogen ovens are distinct from microwave ovens in that they use inert halogen gas to cook rather than radio waves. Both are able to cook foods in a relatively short period of time, however.
Halogen ovens heat food by way of a halogen element and a fan. The halogen gas is used to create a powerful light that in turn quickly generates intense heat, which is circulated internally by the fan. Halogen ovens also typically resemble a bowl or dome rather than the typical rectangular design of a microwave. Food is also placed in and taken out through a top lid rather than a front-facing door.