The espresso drink made with chocolate syrup and steamed milk is a caffè mocha.
A caffè mocha, often shortened to mocha, is a chocolate-flavoured variation of a caffè latte. Its basic structure is espresso, steamed milk and chocolate, commonly supplied by chocolate syrup, cocoa powder or melted chocolate. Cafés may finish it with milk foam, whipped cream, cinnamon or chocolate shavings.
The name comes from Mokha, a Yemeni port that was a major centre of the early coffee trade. Historically, “Mocha” referred to prized coffee exported from Yemen; the modern drink acquired its chocolate meaning later, as coffee-and-chocolate combinations became popular in Europe and North America.
A mocha is easy to confuse with a latte because both contain espresso and steamed milk. The decisive difference is chocolate. A cappuccino generally has a thicker proportion of foam, while a macchiato is espresso marked with only a small amount of milk. “Mochaccino” is a related name whose exact proportions vary by region.