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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...

Amazon EC2 (Elastic Compute Cloud) is one of the most popular AWS services that provides virtual servers (called instances ) in the cloud. You can launch Linux or Windows machines on demand, deploy your applications, and pay only for the compute power you use. What is EC2? EC2 is a cloud service that lets you create and manage virtual servers. These servers come with CPU, RAM, storage, and networking capabilities like a physical machine, but without owning any hardware. You can launch, scale, or delete instances within seconds. AWS even provides free-tier eligible instances (like t2.micro or t3.micro ) for the first 12 months, making it perfect for beginners. Why use EC2 instead of physical servers? No hardware purchase or maintenance Launch servers in minutes Scale up or down instantly Pay only while the instance is running Highly reliable and secure AWS infrastructure Key EC2 Concepts: AMI, Instance Type, Key Pair, Security Group 1. AMI (Amazon Mach...

Amazon S3 (Simple Storage Service) is one of the most important and widely used AWS services. It is a highly scalable, durable, and secure object storage service where you can store any type of file—images, videos, PDFs, logs, backups, or application data. Whether you're building a web application, mobile backend, analytics pipeline, or simply need cloud storage, S3 is often the first service developers work with. What is Amazon S3? Amazon S3 is an object storage service , which means data is stored as objects inside containers called buckets . Unlike traditional file systems, S3 is designed for: High durability (99.999999999%) High scalability Global availability It is ideal for storing: Images, videos, and documents Application uploads Static website assets Logs and analytics data Backups and archives S3 is accessible from anywhere over the internet or directly from AWS applications and services. Key Concepts: Bucket, Object, Key, Regi...