Mocha is a high quality type of coffee made from a specific coffee bean. It's easily confused with the flavored drink also called a mocha, which combines coffee and chocolate.
Mocha coffee beans are from the plant species called Coffee arabica, and it was originally only grown in Mocha, Yemen. Most people who order mochas in coffee shops have a more complicated drink in mind: the hot or cold mixture of coffee or espresso, milk, and chocolate. Anything mocha flavored will echo this coffee-chocolate combination, while something mocha colored will be a similar brown shade.