Universally unique identifiers (UUIDs) are a fun and exciting way to identify things. We can issue UUIDs forever 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. Advanced and little-known features of ramsey/uuid will be covered.