As you can see, many objects contain other objects. For instance, the desk contains the computer, which contains the web browser window, which contains the web page, which contains the graphics.
Now, each object has properties. For instance, a web page has a background color, and it uses a certain font. These are properties. But, the background color could also be considered an object, with the property being the actual color. Don’t feel confused. For now, all you need to know is that there are objects and objects have properties.