CloudFormation is AWS’s native Infrastructure as Code (IaC) service, which treats infrastructure as code, allowing you to model, provision, and manage AWS and third-party resources.

Cloud caching service with two underlying engines: Redis and Memcached .
It can assist in implementing Shard.

Distributed NoSQL database service.
Data access must be obtained through the corresponding Role (EC2) or using Credentials (developer) with IAM.

Amazon Simple Queue Service (SQS) serves as a task buffer, allowing tasks that do not require immediate processing to be placed in the queue for storage.
When the system has spare resources, it processes these tasks, which helps decouple applications.

Monitoring applications and automatically scaling machines based on traffic changes, aiming to maintain stable and predictable performance at the lowest possible cost.

Elastic Load Balancer (ELB) achieves traffic distribution and load balancing.
ELB distributes incoming application traffic across multiple targets and virtual devices in one or more Availability Zones(AZ) and generates Access logs.

Amazon CloudFront is a content delivery network (CDN) service that addresses DDoS and repetitive access to static resources.