This presentation discusses mutable and immutable properties of data objects in Python. It explains that everything in Python is an object that can be either mutable or immutable. Mutable objects like lists, dictionaries, and sets can be changed after creation, while immutable objects like integers, floats, strings, and tuples cannot be changed. The presentation also demonstrates how mutable and immutable objects are passed to functions, with mutable objects behaving like pass by reference and immutable objects behaving like pass by value.