Primogeniture is a legal and social system where the firstborn child inherits the entire estate or the majority of the family's wealth. This practice has been common in many cultures throughout history, particularly among the nobility and aristocracy. It was designed to keep large estates intact and prevent the division of property among multiple heirs. In a primogeniture system, younger siblings often receive little to no inheritance, which can lead to social and economic challenges. This practice has evolved over time, and many modern societies have moved towards more equitable inheritance laws that allow for the distribution of assets among all children.