A spear is like a long stick with a sharp pointy end that people have been using for a really, really long time. They used to use it for hunting animals, kind of like a really big stick that they could throw at the animal to catch it. But sometimes they would also use it to protect themselves or their families from danger, like in a war or battle. The pointy end is very sharp so it can hurt whatever it hits, but you have to be careful when using it because it can hurt people too. Nowadays, people still use spears for some things, but mostly they are used for sports like javelin throwing.