Marriage blanc is when two people get married but they do not want to be in a romantic relationship with each other. Instead, they get married for other reasons like for financial or legal benefits. It is like playing pretend. Just like how two kids might play house and pretend to be a family, adults can also play house and pretend to be a married couple.
However, marriage blanc is not always allowed or legal in all places. Some places require that a marriage must be based on love and romantic feelings to be valid. It is important to make sure that people getting married are doing it for the right reasons and are happy together.