- Sets in Python are used when we are primarily interested in operations that we know from the set theory.
- See also the Venn diagrams.
- In day to day speach we often use the word "group" instead of "set" even though they are not the same.
- What are the common elements of two set (two groups).
- Is one group (set) the subset of the other?
- What are all the elements that exist in both groups (sets)?
- What are the elements that exist in exactly one of the groups (sets)?