Universally unique identifiers—a.k.a. UUIDs—are a fun and exciting way to identify things. Use them to identify books, documents, parents, pets, bread, apples, very small rocks—the list goes on! But why stop there? We can keep issuing UUIDs for eternity and never run out. They’re practically unique. Join this whirlwind adventure in search of the perfect identifier to find out why UUIDs might be good for your projects. Along the way, you’ll learn what is a UUID, the various types of UUIDs, pros and cons of using UUIDs, and how to use the ramsey/uuid library to generate all kinds of UUIDs. Advanced and little-known features of ramsey/uuid will be covered.