A witkar is kind of like a taxi, but instead of a big car with a fancy driver, it's a little car that you can drive yourself! Imagine a small car that you don't need a special license to drive, and that you can pick up from a special parking spot in the city. You can then drive it around town for as long as you need, and when you're done, you just drop it off at another parking spot and leave it there for the next person to use. This helps save the environment by reducing the number of big, polluting cars on the road, and it also helps people save money by only paying for the time they actually use the car. Plus, it's kind of fun to be in charge of your own little car adventure!