Amazon SNS is a web service provided by the AWS. SNS stands for Simple Notification Service, and it manages and delivers the messages or notifications to the users and clients from any cloud platform. In SNS, there are two types of clients, subscribers, and publishers. Publishers produce and send a message to the subscriber instance through the communication channels.

Amazon Web Services
Amazon Web Services (AWS) is the world’s most comprehensive and broadly adopted cloud platform, offering over 175 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.
Amazon Web Service
Amazon Lambda

Amazon Cognito

Amazon Cognito is controls user authentication and access for mobile applications on internet-connected devices. The service saves and synchronizes end-user data, which enables an application developer to focus on writing code instead of building and managing the back-end infrastructure. This can accelerate the mobile application development process.
Amazon Cloudfront

To Know how fast your website is working, you can use the CloudFront service. It speeds up the sharing of your dynamic and static web content such as .css, .html and image files to your users. It securely delivers your images, videos, data and applications to users and clients with high transfer speed and low latency, all within a developer-friendly environment.