Bubble tea, also known as pearl milk tea, is a popular Taiwanese drink that originated in Taichung. It is made with a base of tea, usually black or green tea, mixed with milk or fruit flavors. The drink is then sweetened and topped with chewy tapioca pearls or other toppings like jelly or fruit. Bubble tea comes in various flavors and can be served hot or cold. It has gained international popularity and is a must-try when visiting Taichung.