When you go to school, you start in preschool or kindergarten, where you learn basic things like saying your ABCs and counting. As you get older, you go to higher grades and learn more things, like reading and writing, math, science, and history. When you finish high school, you can choose to go to college, where you learn even more things about a specific subject, like engineering, psychology, or English.
But some people want to learn even more about a specific subject, so they go to school for a really long time and get what's called a doctorate degree. It's like becoming a super expert in one thing. To get a doctorate degree, you usually have to go to college for four years and get a bachelor's degree. Then, you go to graduate school for a few more years where you study even more things about your subject and do a lot of research.
After you finish graduate school, you have to write a big paper or book called a dissertation. It's like a report on all the research you did. You have to explain what you did, why you did it, and what you found out. It's a lot of work, but when you finish, you get to call yourself a doctor!
People with doctorate degrees usually become professors, scientists, or researchers. They get to teach other people about what they know or they do important research to help people. It's like being a superhero for your subject!