This lecture explores list operations and mutability: mutation, aliasing, and tricky examples with loops over L. Lists and tuples provide a way to organize data that naturally supports iterative functions. Tuples are useful when you have data that doesn’t need to change, e.g., (latitude, longitude) or (page #, line #). Lists are useful in dynamic situations, e.g., a list of daily top 40 songs or a list of recently watched movies.