Amazon Simple Notification Service (Amazon SNS) is a web service that makes it easy to set
up, operate, and send notifications from the cloud. SNS can be used to send automated or
manual notifications to email, mobile (SMS), SQS, and HTTP endpoints
Amazon Simple Queue Service (SQS) is a fully managed message queuing service that enables
you to decouple and scale microservices, distributed systems, and serverless applications
Amazon SWF helps developers build, run, and scale background jobs that have parallel or
sequential step
Amazon Simple Email Service (Amazon SES) is a cloud-based email sending service designed to
help digital marketers and application developers send marketing, notification, and
transactional emails