Okay, so imagine that one day you have a friend, and this friend falls in love with someone and decides to get married. When someone gets married, it means that they are going to spend the rest of their lives with the person they love, and they are going to start a new family together.
In some cultures, when a man and a woman get married, the man has to give something special to the woman's family as a way of saying thank you for letting him marry their daughter. This special thing is called a bride service, which means that the husband will do something nice for his wife's family as a symbol of gratitude.
Now, this bride service can mean different things depending on the culture. In some places, the husband has to work for the woman's family for a certain period of time, while in others he has to give gifts or food to the family. Sometimes the bride service can be a lot of work, but it's seen as an important tradition that helps bring two families together.
So, in summary, a bride service is something that some cultures require as part of the wedding ceremony. It's a way for the man to show appreciation and respect to his new wife's family, and it helps to create a bond between the two families as they come together to celebrate the marriage.