Why is this the answer?

The answer is fire because this fun riddle describes exactly what a flame needs to stay alive and what happens if you get too close to it. Let us look closely at the first part of the riddle: "I am always hungry, I must always be fed." Think about a campfire, the flames on a gas stove, or the fire in a fireplace on a chilly evening. Fire acts just like it is always hungry because it constantly needs food to keep burning brightly. This "food" is called fuel, and it can be everyday things like logs of wood, sheets of paper, or even little pieces of coal. The fire does not truly eat like a person or a pet, but it uses the fuel to make heat and light in a process called combustion. This process uses up the fuel very quickly. If you stop adding fuel, the fire will eventually burn up everything that is left around it and go out completely. That is why people who watch over a fire must keep "feeding" it new fuel so the flame can stay hot and warm for a long time. Without a constant supply of things to burn, the fire cannot live on its own, which is a perfect match for the first two lines of the riddle. It has a powerful, never-ending hunger that only fuel can stop. Now, let us think about the second clue: "The finger I lick will soon turn red." This is a very tricky and important part of the riddle. A fire's "lick" is like the quick touch of its flame or even the powerful heat coming off the flames. Fire is incredibly hot, and if the flame or the heat touches your skin, even for a short second, it will cause a burn very quickly. A burn makes your skin turn bright red, and it can hurt a lot. This clue is a clever but serious way to remind everyone that fire is something very useful for things like cooking and keeping us warm, but it must always be treated with great care and respect because it is dangerous. Grown-ups need to be in charge whenever fire is being used. The riddle uses this picture of the finger turning red to show how hot and powerful the flame's touch is. So, the answer is fire because it needs fuel to survive, just like being fed, and its extreme heat is so strong that its "lick" will hurt and turn a finger red. This simple object is truly one of the most useful but also one of the most powerful things in our world.