The United Kingdom is a big group of people who live in a big area called a country. To make sure that everything runs smoothly, the people who live there have created a system called the government, which is made up of different groups called departments.
Each department has a special job to do to help take care of the country and its citizens. For example, one department is called the Department of Health and Social Care. Their job is to make sure that everyone in the country is healthy and gets the help they need when they are sick.
Another department is called the Department for Education. Their job is to help make sure that kids are going to good schools and that they are learning important things to help them grow up and become successful.
There are lots of other departments too, all working together like a big team to help take care of the country and its people.