In Western countries, chai is a sweet, milky, slightly spicy tea. If you're not a coffee drinker, you might start your day with a hot cup of chai instead.
The word chai means "tea" in Hindi, from the Mandarin word for "tea," ch'a. This is why it might make a South Asian person giggle to hear you order a "chai tea," which literally means "tea tea." In India, masala chai is the specific name of the familiar milky tea flavored with cinnamon, clove, cardamom, and other spices that's so beloved around the world.