Amazon Web Services (AWS) is a secure cloud services platform, offering to compute power, database storage, content delivery, and other functionality to help businesses scale and grow.
If you are new to AWS, this link may help you to understand better
https://blog.usejournal.com/what-is-aws-and-what-can-you-do-with-it-395b585b03c
Anyways, here is the document attached to know all about how to create a new instance in AWS. Document here demonstrates creating a new aws instance by taking FreeSWITCH as an example.
Creating Freeswitch AWS instance