A student is a person who goes to school and is learning something. Students may be children, teenagers or older adults who are going to school, but it may be other people who are learning, such as a young student at a college or university, often called a student.
Generally students can learn from a teacher or lecturer while at university. They also study a lot. A student can also be a person studying for a particular profession. Where teaching is called training, a student can be called a trainee.