The term "unaccompanied minors" refers to children who are traveling alone, without being accompanied by an adult or a guardian. This could be due to various reasons such as their parents working abroad and sending them to join later, or the child being sent to live with relatives or friends while they wait for their family to relocate. These minors may require special assistance at airports, train stations or other transportation hubs, as they are not traveling with an adult who can help them navigate through the process.