AWS is Amazon's cloud services platform and one of the most widely used in the world. It offers more than 200 services, including storage, databases, artificial intelligence, and networking. Companies like Netflix, Airbnb, and Twitter use AWS to scale their operations and improve the performance of their applications. AWS allows for the secure deployment of applications with high availability and without the need to manage physical hardware. Its flexibility and pay-as-you-go model make it an ideal choice for startups and large companies.