The United States Border Patrol is a group of people who work to keep our borders safe. Borders are like lines that separate one country from another. These border patrol people work along the borders of the United States to make sure that only the people who are allowed in the United States can come across the border.
They do this by checking people's identification papers, making sure they have the right papers to come into the United States. They also look for things that might be dangerous, like weapons or drugs. If they find someone trying to get into the United States who shouldn't be there or who is doing something illegal, they can arrest them and take them back across the border.
This is important because the United States wants to keep the people who live here safe and make sure that everyone who comes into the country is doing so legally. The United States Border Patrol helps to make sure that the United States is a safe place for everyone who lives here.