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• a generator is an iterator
• an iterator is an iterable

examples/generators/iterable.py

from collections.abc import Iterator, Iterable
from types import GeneratorType

print( issubclass(GeneratorType, Iterator) )  # True
print( issubclass(Iterator, Iterable) )       # True

• Genarators are a simpler way to create an iterable object than iterators, but iterators allow for more complex iterables.
• To create an iterator we need a class with two methods: __iter__ and __next__, and a raise StopIteration.
• To create a generator we only need a single function with `yield .