A one-to-one relationship is a connection between two entities where each record in one entity is related to at most one record in another entity. In our example, we will consider a student and a mark sheet, where one mark sheet can be associated with only one student and vice versa.

JWT stands for JSON Web Token (JWT), a compact and self-contained way for securely transmitting information between parties as a JSON object. It is important to note that JWT is used for authorization, not authentication.