Machine Learning vs AI

I know nothing of Machine Learning yet (at least by that name), but that phrase reminds me of Artificial Intelligence. Are these related?

Yes; machine learning stemmed from AI. Wikipedia provides a reasonable explanation of what machine learning is and should give you an understanding of its relationship with AI.

From Wikipedia: "Machine learning, a branch of artificial intelligence, is a scientific discipline concerned with the design and development of algorithms that allow computers to evolve behaviors based on empirical data, such as from sensor data or databases."

or said another way.

in AI there are many, many techniques encapsulated.

ML has to do with algorithms where the machine (or computer) will grow and understand a pattern that a non-learned machine (or person) may (will) not.

naural networks are ML, genetic system are ML, expert system are not.