Circoscrizione is a big word that means dividing a big place into smaller areas. Imagine you have a big cake and you need to share it with your friends. You can't just cut it into big slices and give one to each friend because the cake will run out quickly. So, you decide to cut the cake into smaller pieces and give a piece to each friend. The same thing happens with a country or a city. It's too big to manage in one go, so it's divided into smaller parts.
In Italy, for example, the country is divided into regions, and each region is divided into provinces, and each province is divided into municipalities or comuni. Within each of these areas, there are circoscrizioni or districts that further divide the area.
These districts help the government and the people manage the area better because it's easier to focus on smaller areas and make sure everyone's needs are met. For example, if there is a problem with the roads in a particular district, it's easier for the government to fix the roads in that area rather than trying to fix all the roads in the entire city at once.
In short, circoscrizione is a way to divide big places into smaller areas so that it's easier to manage and take care of everyone's needs.