A latte, in contrast, is made of one part coffee, three parts milk and is then topped with foam, while a flat white is stronger – it has a double shot of espresso and is topped with milk and then finished with ‘micro-foam’.
Article source: https://www.huffingtonpost.co.uk/entry/cappuccino-name-explained-coffee-milk_uk_6a4bd036e4b094d71e6f7832