You've most likely heard people mention a couple of different types of wills when it comes to estate planning, and the most common is a "last will and testament," or known as a "will." But you may have also heard people talk about what's called a "living will." Both terms describe important legal documents, but their purpose and how they work are very different. We'll discuss some of the most critical things you should know about living wills and why it's essential in every adult's estate plan.