Imagine playing with toy knives, but these are not real knives and are safe to play with. Kunai is a similar type of knife, but it's not a toy. It's a real weapon.
Kunai is a pointed tool that was originally used for farming and gardening in Japan. Over time, people started using it for self-defense, as a throwing weapon, and even ninja warriors used it as a tool for climbing walls and trees.
Kunai is made up of a metal blade that is sharp on one end and has a looped handle on the other end. The handle is very important because it provides a good grip. It's also useful for tying a rope for climbing or throwing.
The blade of a kunai can be very sharp or dull depending on its use. It's not a very big weapon compared to a sword or spear, but it can still be deadly in the hands of an expert.
In summary, kunai is a type of small knife that was originally used in Japan for farming and gardening but later became a popular weapon for self-defense and ninja warriors. They have a sharp metal blade on one end and a looped handle on the other end, making it easy to hold and use.