The effects of fire on landscapes depend on the interaction between the five components that integrate the fire regime. That is, plants are not adapted to fire per se, but to a certain fire regime. Similarly, wildfire management depends on the interaction between the biotic and abiotic features on the site and the fire regime. The fire regime, in turn, is defined on the basis of the type of fire that occurs in an area, its intensity and severity, frequency, seasonality, and the mosaic of burned patches. At global scales, fire regime syndromes may be grouped into five different pyromes. In this chapter, we explore the notion of the fire regime and its implications from local to global scales.