Amazon Web Services (AWS): 

What is AWS?

Amazon Web Services (AWS) is a cloud computing platform provided by Amazon, offering a wide range of services like computing power, storage, databases, networking, AI, security, DevOps, and more. AWS is the largest and most widely used cloud platform globally, serving businesses of all sizes.

Key Features of AWS

✔ Scalability – Easily scale applications up or down based on demand.
✔ Cost-Efficiency – Pay-as-you-go pricing model.
✔ Security – Multi-layered security with compliance and encryption.
✔ Flexibility – Supports multiple operating systems and programming languages.
✔ Global Reach – Data centers (Availability Zones) across the world.
✔ Reliability – High availability with failover mechanisms.
✔ Automation & DevOps – CI/CD, monitoring, and serverless options.

AWS Global Infrastructure

• Regions – Physical locations where AWS data centers are present.
• Availability Zones (AZs) – Data centers within each region for redundancy.
• Edge Locations – CDN (CloudFront) for faster content delivery.

Core AWS Services

AWS offers 200+ cloud services across various domains. Below are the most important categories:

1️⃣ Compute Services

🔹 Amazon EC2 (Elastic Compute Cloud) – Virtual servers in the cloud.
🔹 AWS Lambda – Serverless computing (Run code without managing servers).
🔹 Amazon ECS (Elastic Container Service) – Managed container service.
🔹 Amazon EKS (Elastic Kubernetes Service) – Kubernetes on AWS.
🔹 AWS Elastic Beanstalk – PaaS for web apps.

2️⃣ Storage Services

🔹 Amazon S3 (Simple Storage Service) – Scalable object storage.
🔹 Amazon EBS (Elastic Block Store) – Block storage for EC2.
🔹 Amazon Glacier – Low-cost, long-term storage.
🔹 AWS Storage Gateway – Hybrid cloud storage solution.

3️⃣ Database Services

🔹 Amazon RDS (Relational Database Service) – Managed databases (MySQL, PostgreSQL, Oracle, SQL Server).
🔹 Amazon DynamoDB – NoSQL database for fast scalability.
🔹 Amazon Aurora – High-performance relational database.
🔹 Amazon Redshift – Data warehouse for analytics.
🔹 ElastiCache – In-memory caching (Redis, Memcached).

4️⃣ Networking & Content Delivery

🔹 Amazon VPC (Virtual Private Cloud) – Private cloud networking.
🔹 Elastic Load Balancer (ELB) – Distributes traffic across instances.
🔹 AWS CloudFront – Content Delivery Network (CDN).
🔹 Route 53 – Domain Name System (DNS).

5️⃣ Security & Identity Services

🔹 AWS IAM (Identity and Access Management) – User authentication & permissions.
🔹 AWS Shield – DDoS protection.
🔹 AWS WAF (Web Application Firewall) – Protects web applications.
🔹 AWS Secrets Manager – Secure credentials storage.

6️⃣ DevOps & Monitoring

🔹 AWS CloudFormation – Infrastructure as Code (IaC).
🔹 AWS CodeDeploy – Automated deployments.
🔹 AWS CloudWatch – Monitoring and logging.
🔹 AWS X-Ray – Debugging and tracing applications.

7️⃣ Machine Learning & AI

🔹 Amazon SageMaker – Train & deploy machine learning models.
🔹 Amazon Rekognition – Image & facial recognition.
🔹 Amazon Polly – Text-to-speech.
🔹 Amazon Lex – Chatbot services (Alexa backend).

8️⃣ Analytics & Big Data

🔹 AWS Glue – ETL (Extract, Transform, Load) service.
🔹 Amazon Kinesis – Real-time data streaming.
🔹 Amazon Athena – Serverless query engine.

9️⃣ Internet of Things (IoT)

🔹 AWS IoT Core – Connect & manage IoT devices.
🔹 AWS Greengrass – Local compute for IoT.

AWS Pricing Model

1️⃣ Pay-as-you-go – Pay only for what you use.
2️⃣ Reserved Instances – Prepaid plans for long-term savings.
3️⃣ Spot Instances – Buy unused capacity at a discount.
4️⃣ Free Tier – Limited free usage for 12 months.

Popular AWS Certifications

✅ AWS Certified Cloud Practitioner – Entry-level certification.
✅ AWS Certified Solutions Architect (Associate & Professional) – Cloud architecture design.
✅ AWS Certified Developer – Associate – Develop & maintain AWS applications.
✅ AWS Certified SysOps Administrator – Associate – Manage & deploy on AWS.
✅ AWS Certified DevOps Engineer – Professional – Automate cloud deployments.

AWS Use Cases

• Web Hosting – Scalable websites with EC2, S3, RDS.
• E-commerce – Secure, scalable stores using AWS Lambda, DynamoDB.
• Big Data & Analytics – Process massive datasets with Redshift, Athena.
• AI & Machine Learning – Train models with SageMaker.
• IoT Applications – Manage IoT devices with AWS IoT Core.
• Media Streaming – Host videos, audio via CloudFront, Media Services.