What is object oriented classes and the relationship between them?

Answer 1

I would need more info on the specifics of what you are asking, since this is a pretty broad question.

A class is a definition for the rules an object follows.

There can be lot's of relationships between classes in loads of different ways, for example, in the browser each tab is an object, and within each tab is a page, which is an object, inside that object is the document object, which contains elements on the page, all objects, and each object has more objects as it's children defining things like attributes, image urls and text content.

Or you could mean that an object is built on another, for example using the browser again as an example all elements on the page are children to the same basic build, but each one has different features and defaults, an input box is still a HTML element, but it contains features others may not have. they do however have the same basic structure.