Answer the following Q with stream of consciousness. Passage: Boba tea (also known as pearl milk tea, bubble milk tea, boba juice, boba tea, or simply bubble tea) (Chinese: 波霸 奶茶; pinyin: bōbà nǎichá, with tapioca balls it is 珍珠 奶茶; zhēnzhū nǎichá) is a Taiwanese tea-based drink invented in Tainan and Taichung in the 1980s. Most bubble tea recipes contain a tea base mixed with fruit or milk, to which chewy tapioca balls (known as bubbles, pearls, or boba) and fruit jelly (especially tropical fruits like lychee) are often added. Ice-blended versions are usually mixed with fruit or syrup, resulting in a slushy consistency. There are many varieties of the drink with a wide range of ingredients with some ingredients being mango, taro, coconut, and peach. The two most popular varieties are bubble milk tea with tapioca and bubble milk green tea with tapioca.

Question: Based on this passage, what are the little balls in boba tea?
To answer the above question, the relevant sentence is: Most bubble tea recipes contain a tea base mixed with fruit or milk, to which chewy tapioca balls (known as bubbles, pearls, or boba) and fruit jelly (especially tropical fruits like lychee) are often added. Therefore, the final answer is chewy tapioca balls.