Final answer:
An instance variable, or attribute, in an Object DB is a variable associated with a specific object or instance of a class that holds the state or data specific to that object. Example: In a 'Car' class, each instance of the class would have its own values for model, color, and mileage. Instance variables are important for individual customization and data management in an Object DB.
Step-by-step explanation:
An instance variable, also known as an attribute, in an Object Database (Object DB) is a variable that is associated with a specific object or instance of a class. It holds the state or data specific to that particular object, and its values can be different for different objects of the same class.
For example, consider a class called 'Car' with instance variables 'model', 'color', and 'mileage'. Each instance of the 'Car' class, such as 'car1', 'car2', and 'car3', will have its own values for these instance variables.
'car1' might have model='Honda', color='red', and mileage=10000, while 'car2' might have model='Toyota', color='blue', and mileage=5000.
Instance variables are essential for storing and manipulating the specific characteristics or properties of objects in an Object DB, allowing for individual customization and data management.