What is AWS

AWS is "Amazon Web Services" a cloud platform.
Cloud computing is the on-demand availability of computer system resources, especially data storage and computing power, without direct active management by the user.

AWS is Amazon’s ancillary and technically speaking it is a cloud computing platform that provides customers with a wide arrangement of cloud services. We can define AWS (Amazon Web Services) as a very safe cloud services platform that offers computing power, storage of the database, delivery of the content and various other functionalities.

In layman’s term, suppose we need electricity at our home, either we can generate our own electricity or purchase it from other power brands. Instead of that, we could purchase electricity and pay as we use it. Similarly, AWS is one of the cloud computing providers that provide us computing, storage, networking and a lot more services that we can pay while we use.

AWS is the world’s most comprehensive and broadly adopted cloud platform, offering over 200 fully featured services from data centers globally. Millions of customers—including the fastest-growing startups, largest enterprises, and leading government agencies—are using AWS to lower costs, become more agile, and innovate faster.

AWS has many services you can get more detail from here
https://docs.aws.amazon.com/index.html