Imagine you are playing with your toys in your room and suddenly someone comes in and starts hitting you. That's what some Islamic extremists are doing in Bangladesh. Instead of toys and people, they are attacking other people with violence.
These extremists believe in a strict interpretation of Islam and think that anyone who disagrees with them should be punished, including innocent people who are just going about their lives. They think that other religions and beliefs are wrong, and that everyone should follow their way.
Sometimes, they attack public places like cafes or shops, because they think these places are promoting beliefs that they don't agree with. They also attack people who speak out against them or criticize their beliefs. It's like if someone got mad at you for saying you liked red crayons and then started hitting you.
These attacks are very sad and harmful to people in Bangladesh. It's important for everyone to be respectful of each other's beliefs and to not use violence to solve differences.