1. Amazon SNS vs Amazon SQS
*SNS = Publish/Subscribe broadcast;
SQS = Message queue for processing;
2. Amazon EBS vs Amazon EFS vs Amazon S3
EBS = Block storage for one EC2;
EFS = Shared file system for many EC2
S3 = Object storage for any scale and anywhere
3. AWS CloudWatch vs AWS CloudTrail
CloudWatch = Performance/metrics;
CloudTrail = Activity & API audit;
4. Auto Scaling vs Elastic Load Balancing
Auto Scaling = Adjusts instance count;
ELB = Distributes incoming traffic;
5. IAM Roles vs IAM Policies
Roles = Identities with permissions;
Policies = Permission definitions;
6. RDS vs DynamoDB
RDS = Managed SQL DB;
DynamoDB = Managed NoSQL DB
7. NAT Gateway vs Internet Gateway
NAT GW = Outbound internet from private subnets;
IGW = Full internet access
8. VPC Peering vs VPN vs Direct Connect
VPC Peering = Private AWS-to-AWS link;
VPN = Secure internet link to on-prem
9. AWS Lambda vs AWS Fargate
Lambda = Event-driven functions;
Fargate = Serverless container hosting;
10. AWS Config vs AWS Systems Manager
Config = Tracks changes & compliance;
SSM = Automates operations & management
*** Many AWS services complement each other — the confusion often comes from overlapping names, not overlapping functionality.**
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