Monzo is a British online bank based in London, founded in 2015. It emerged as a challenger bank, aiming to transform traditional banking by offering a mobile-first experience. Monzo provides personal and business banking accounts, including current and savings accounts, lending products, and investment options managed by BlackRock. The company focuses on solving problems for its customers, offering features like instant notifications, budgeting tools, and fee-free spending abroad. Monzo has grown significantly, serving over 12 million customers in the UK and expanding its product offerings and market presence, including plans for the US and Europe.