AWS Certificate Manager (ACM) is an AWS security service used to create, manage, and renew SSL/TLS certificates. These certificates encrypt data between users and your website or application.
With AWS Certificate Manager, you can easily use SSL/TLS certificates with services like Elastic Load Balancer (ELB), Amazon CloudFront, and Amazon API Gateway without manually renewing them.
In simple words, AWS Certificate Manager (ACM) secures your website by providing SSL/TLS certificates that enable HTTPS and encrypt data sent over the internet.