You know how you play with your toy cars and sometimes you crash them into each other? Well, some people do something similar, but with real cars and they use them to hurt other people on purpose. This is called a vehicle-ramming attack.
It's like when someone wants to hurt other people, but they don't want to use a gun or a knife. Instead, they get into a car and drive it really fast into a crowd of people or a building. This can be very dangerous and can hurt a lot of people at once.
Sometimes, people who do these kinds of attacks have a reason why they want to hurt other people, such as a disagreement about politics or religion. But no matter what the reason is, it's never okay to hurt others on purpose.
That's why it's important for people to be aware of their surroundings and stay safe, especially in crowded places like festivals or busy streets. It's also important for police and other authorities to work hard to prevent these kinds of attacks from happening.