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Amazon API Gateway acts as a single entry point for all your backend services, making it easier to create, manage, secure, and monitor APIs at scale. This beginner-friendly post explains what API Gateway is, why it’s needed, and how it works using a simple demo. What is AWS API Gateway? Amazon API Gateway is a fully managed AWS service that lets you create, publish, maintain, monitor, and secure REST, HTTP, and WebSocket APIs . It works as a “front door” for applications to access data and business logic running on: AWS Lambda EC2 or on-prem servers Containers (ECS/EKS) AWS services like DynamoDB, SQS, Step Functions Even external APIs outside AWS API Gateway handles routing, request validation, throttling, authentication, performance optimization, and monitoring so you don’t have to build these features manually. Why Do We Need an API Gateway? Without an API Gateway, every client (web, mobile, third-party apps) must talk directly to multiple backen...

AWS Command Line Interface (AWS CLI) is a powerful tool that allows developers and DevOps engineers to manage AWS services directly from the terminal. Instead of relying on the AWS Management Console, you can perform tasks faster and automate them using simple commands. What Is AWS CLI? AWS Command Line Interface (AWS CLI) is a unified tool used to interact with AWS services using terminal commands. It allows you to manage resources like EC2, S3, IAM, Lambda, and more without opening the browser. Manage AWS resources efficiently Automate operations using scripts Avoid human errors from console usage Handle large workloads (like thousands of S3 files) Why AWS CLI Matters Relying only on the AWS Console becomes slow and difficult when handling: Multiple environments (dev, stage, prod) Large-scale S3 operations Repetitive tasks like uploads, backups, cleanups AWS CLI solves these issues by enabling tasks to be completed with a single command or thr...

AWS Lambda is a fully serverless compute service that lets you run code without provisioning or managing servers. You are billed only for the time your function actually runs—unlike EC2, where you pay even when the server is idle. Lambda automatically scales, executes only when triggered, and shuts down after execution. What AWS Lambda Does Runs small pieces of code called functions written in Java, Python, Node.js, Ruby, and more. No server, OS, CPU, RAM, or patching management—AWS handles everything. Billed only per invocation and execution time. Ideal for event-driven, bursty, or low-traffic workloads. How AWS Lambda is Triggered A Lambda function does nothing until a trigger fires. Common triggers include: S3 — Run code when files are uploaded or deleted (e.g., image resizing). SQS / SNS — Process messages as they arrive. API Gateway — Build serverless REST APIs where each HTTP call invokes Lambda. EventBridge / CloudWatch — Cron jobs...

AWS Identity and Access Management (IAM) is the backbone of AWS security. It allows you to control who can access your AWS resources and what actions they can perform. IAM is a global service , meaning it protects your entire AWS account regardless of region. This guide covers IAM concepts such as users, groups, roles, policies, access keys, and Identity Center — with real-world analogies and Spring Boot examples. What is AWS IAM? AWS Identity and Access Management (IAM) is a centralized service that controls access to AWS resources like EC2, S3, Lambda, DynamoDB, and more. IAM defines: Who can access AWS What they can do Which services they can use IAM is essential before deploying any production workload. Real-World Analogy of IAM Imagine a company where employees receive access cards, computer accounts, and tool permissions. The security team decides who gets access to rooms, tools, and systems. IAM works exactly like that, but in the cloud. Instead of ph...