Tequila is extraordinary because its production still hinges on the centuries-old knowledge of jimadores - farmers who harvest the blue agave plant, and who are able to tell when it's ready to be harvested. Once the spiky leaves are trimmed away, the core of the plant is baked, mashed, and then the juice is fermented and distilled. Depending on the method and time, tequila can be silver (or blanco), joven/oro (flavoured or blended silver tequila), reposado (rested/aged), anejo (aged) or extra anejo. Silver tequila is pretty harsh, but makes a great base for cocktails; while reposado and anejo can make great sipping tequila - in Mexico, it's normally consumed neat, and the differences in quality are easily tasted.
And what's the difference between tequila and mezcal? Well, tequila is always made from blue agave, while mezcal can be from any type of agave. The more you know!