Apple Inc. is an American multinational technology company that specializes in consumer electronics, computer software, and online services. Apple is the worlds largest technology company by revenue (totalling $274.5 billion in 2020) and, since January 2021, the worlds most valuable company. As of 2021, Apple is the worlds fourth-largest PC vendor by unit sales, and fourth-largest smartphone manufacturer. It is one of the Big Five American information technology companies, along with Amazon, Google, Microsoft, and Facebook.