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AWS Cognito is a user & identity management service that lets you implement user login and signup into your web and mobile applications. It is built to handle multi-device authentication seamlessly, enabling your users to use the same login on their web, mobile and desktop applications. Cognito integrates with AWS Pinpoint to provide you with analytics on user behavior, helping you to better segment your audience. With a few pros and cons, it is a great tool to implement user authentication for your next product or service.