Tim Cook is stepping down as CEO of Apple. Here’s a look at his 15-year legacy, from new products and services to China expansion.

Apple's CEO, Tim Cook, is stepping down after 15 years at the helm. He joined Apple in 1998 and succeeded Steve Jobs in 2011, transforming the company into a powerhouse worth $4 trillion. Under Cook's leadership, Apple's market capitalization increased tenfold, with the company's value rising from $350 billion to $4.01 trillion