Compute:
- EC2: Virtual machines. Know instance types (t3, m5, c5)
- ECS/EKS: Container orchestration (ECS is AWS-native, EKS is managed K8s)
- Lambda: Serverless functions ( minute max)
Storage:
- S3: Object storage. nines durability
- EBS: Block storage for EC2. Single-AZ
- EFS: Managed NFS. Multi-AZ, shared
Networking:
- VPC: Virtual private network
- ALB/NLB: Application (L7) and Network (L4) load balancers
- Route 53: DNS and health checking
Interview tip: Know when to use each. S3 for objects, EBS for databases, EFS for shared filesystems.