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What is AWS ​

Summary ​

  • Amazon Web Services (AWS) is a comprehensive cloud platform offering 200+ fully managed services so you can build applications without owning physical data centers.
  • Cloud computing with AWS follows an on‑demand, pay‑as‑you‑go model with virtually unlimited scale, global reach, and strong security/compliance foundations.
  • At the intro level, you mainly need to understand what problems AWS solves, how it differs from traditional IT, and the main service categories.

AWS overview mindmap ​

mermaid
mindmap
  root((What is AWS?))
    Cloud Computing
      On-demand
      Pay-as-you-go
      Elastic & scalable
    Why AWS
      Global infrastructure
      Security & compliance
      Cost flexibility
      Pace of innovation
    Service Categories
      Compute (EC2, Lambda, ECS/EKS)
      Storage (S3, EBS, EFS, Glacier)
      Database (RDS, DynamoDB, Aurora, Redshift)
      Networking (VPC, CloudFront, Route 53)
      Security (IAM, KMS, CloudTrail, GuardDuty)
      Monitoring (CloudWatch, X-Ray, Config)

Best Practices (for learners) ​

  • Focus first on cloud characteristics (on‑demand, elasticity, measured service) and value proposition instead of memorizing numeric limits or region counts.
  • Group services by use case—for example, “run a web app” → EC2/Lambda + RDS/DynamoDB + VPC + CloudFront + IAM—so they stick in your mental model.
  • Keep the shared responsibility model in mind: AWS secures the cloud, you secure what you run in the cloud (configuration, data, IAM, networking).
  • When reading AWS docs, capture what the service is, when to use it, and how it compares to alternatives, not every configuration option.
  • Treat the following as your “core five” early on: EC2, S3, RDS, VPC, IAM—most exam questions and real architectures touch at least one of them.

Exam Notes ​

  • For Cloud Practitioner and Solutions Architect – Associate, expect questions that:
    • Ask you to pick the right service category for a given use case.
    • Test your understanding of cloud benefits (agility, elasticity, global reach, cost model).
    • Reference the shared responsibility model with concrete examples.

AWS documentation ​