Ember

An ember, also called a hot coal, is a hot lump of smouldering solid fuel, typically glowing, composed of greatly heated wood, coal, or other carbon-based material. Embers can exist within, remain after, or sometimes precede, a fire. Embers are, in some cases, as hot as the fire which created them.

They radiate a substantial amount of heat long after the fire has been extinguished, and if not taken care of properly can rekindle a fire that is thought to be completely extinguished and can pose a fire hazard.
In order to avoid the danger of accidentally spreading a fire, many campers pour water on the embers or cover them in dirt.
Alternatively, embers can be used to relight a fire after it has gone out without the need to rebuild the fire – in a conventional fireplace, a fire can easily be relit up to 12 hours after it goes out, provided that there is enough space for air to circulate between the embers and the introduced fuel.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain