Within the model container, the properties of that model are shown. Properties store the data in the models. What kind of data can be stored depends on the data type. This datatype defines if the data can be stored as a number, text, image, file, etc.
The more properties your model has, the more information it can store. For example, an Employee model has properties that hold the employee’s name, age, gender, etc.
If you want to know more about each property type and their forms then you should check out this article: Property Reference