UML class diagram is the preferred way to describe information.

A UML class diagram shows classes and their relations.

A Class differs from an Object. The Object is of a Class. The Class may have many instance objects each being of the Class.

Class can be regarded as the “Concept” of something. Like if I have class named “Car” – it is likely to symbolize the fact that there are Cars and Car is a concept that exists and that there are probably instance objects of this class as my car, your car and the car with license plate ABC.