# 5.1 Introduction¶

- Collections are prepackaged data structures consisting of related data items.
- Examples of collections:
  - Favorite songs on your smartphone
  - Contacts list
  - A library’s books
  - Cards in a card game
  - Favorite sports team’s players
  - Stocks in an investment portfolio
  - Patients in a cancer study
  - Shopping list.
- Lists (which are modifiable) and tuples (which are not) have many common capabilities.
- Each can hold items of the same or different types.
- Lists can dynamically resize as necessary.
- The Intro to Data Science section uses the visualization libraries Seaborn and Matplotlib to interactively develop static bar charts containing the die frequencies.

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