Amazon Web Services (AWS) provides 200+ cloud services that help organizations build, deploy, and manage applications without owning physical servers. These services are usually grouped into categories based on their purpose.

Below are the major AWS service categories with common examples:

1. Compute Services

Used to run applications and virtual servers.

Amazon EC2 – Virtual servers in the cloud
AWS Lambda – Run code without managing servers
Amazon Elastic Beanstalk – Deploy and manage web apps automatically
AWS Fargate – Run containers without managing servers
Amazon Lightsail – Easy-to-use VPS for beginners

2. Storage Services

Used to store files, backups, and data.

Amazon S3 – Highly scalable object storage
Amazon EBS – Block storage for EC2 instances
Amazon EFS – Managed file storage
Amazon Glacier – Low-cost long-term backup storage

3. Database Services

Managed databases for applications.

Amazon RDS – Managed relational databases (MySQL, PostgreSQL, etc.)
Amazon DynamoDB – Fully managed NoSQL database
Amazon Redshift – Data warehouse for analytics
Amazon Aurora – High-performance MySQL/PostgreSQL compatible database

4. Networking & Content Delivery

Connect and deliver applications globally.

Amazon VPC – Create isolated cloud networks
Amazon CloudFront – Content delivery network
Elastic Load Balancing – Distributes traffic across servers
Amazon Route 53 – Domain name system service

5. Security & Identity

Manage users and secure resources.

AWS Identity and Access Management – Manage user permissions
AWS Shield – Protect against attacks
AWS WAF – Protect web apps from threats
AWS Secrets Manager – Manage passwords and API keys

6. Machine Learning & AI

Build AI and ML applications.

Amazon SageMaker – Build and deploy ML models
Amazon Rekognition – Image recognition
Amazon Polly – Convert text to speech
Amazon Lex – Build chatbots

7. Monitoring & Management

Monitor applications and infrastructure.

Amazon CloudWatch – Monitor logs and metrics
AWS CloudTrail – Track account activity
AWS Systems Manager – Manage cloud resources

✅ Simple way to remember AWS core services (most commonly used):

Compute → EC2, Lambda
Storage → S3, EBS
Database → RDS, DynamoDB
Networking → VPC, Route 53, CloudFront
Security → IAM
Monitoring → CloudWatch

Below is a detailed explanation of the most commonly used core services in Amazon Web Services (AWS). These services form the foundation of most AWS architectures.

1. Compute Services

1. Amazon EC2 (Elastic Compute Cloud)

Amazon EC2 provides virtual servers in the cloud. It allows you to run applications just like you would on a physical server, but without managing hardware.

Key Features

Scalable – Increase or decrease servers depending on traffic.
Flexible instance types – Choose CPU, RAM, GPU, or storage based on workload.
Pay-as-you-go pricing.
Full control of OS (Linux, Windows).

Important Components

AMI (Amazon Machine Image) – Template used to launch EC2 instances.
Instance Type – Hardware configuration (CPU, memory).
Security Groups – Firewall rules controlling inbound/outbound traffic.
Key Pair – Used to securely access the instance via SSH.

Example Use Cases

Hosting websites
Running enterprise applications
Machine learning workloads
Development and testing environments

2. AWS Lambda

AWS Lambda lets you run code without managing servers.

You upload code and AWS automatically runs it when triggered.

Key Features

Serverless computing
Automatically scales
Pay only for execution time
No server management

Event Triggers

Lambda functions can be triggered by:

File upload to Amazon S3
API requests
Database updates
Scheduled events

Example Use Cases

Image processing
Real-time file processing
Serverless APIs
Automation tasks

2. Storage Services

3. Amazon S3 (Simple Storage Service)

Amazon S3 is object storage used to store unlimited files such as images, videos, backups, and logs.

Key Features

Highly durable (99.999999999% durability)
Unlimited storage
Accessible via HTTP/HTTPS
Versioning support

Important Concepts

Buckets – Containers for storing files.
Objects – Files stored inside buckets.
Storage classes
- Standard
- Intelligent Tiering
- Glacier (archive storage)

Example Use Cases

Website hosting
Backup storage
Data lakes
Media storage

4. Amazon EBS (Elastic Block Store)

Amazon EBS provides block storage volumes for EC2 instances.

Think of it as a virtual hard disk attached to a server.

Key Features

Persistent storage
High performance
Can be attached/detached from EC2
Supports snapshots (backup)

Types of EBS Volumes

gp3 / gp2 – General purpose
io1 / io2 – High performance databases
st1 – Throughput optimized
sc1 – Cold storage

Example Use Cases

Databases
File systems
Applications requiring persistent storage

3. Database Services

5. Amazon RDS (Relational Database Service)

Amazon RDS is a managed relational database service.

AWS handles tasks such as:

Backups
Patching
Scaling
High availability

Supported Databases

MySQL
PostgreSQL
Oracle
SQL Server
MariaDB
Amazon Aurora

Key Features

Automatic backups
Multi-AZ high availability
Read replicas
Automatic scaling

Example Use Cases

E-commerce websites
Banking applications
Enterprise systems

6. Amazon DynamoDB

Amazon DynamoDB is a fully managed NoSQL database designed for high-speed applications.

Key Features

Millisecond latency
Automatic scaling
Serverless architecture
Fully managed

Data Model

Uses:

Tables
Items (rows)
Attributes (columns)

Example Use Cases

Mobile apps
Gaming leaderboards
IoT applications
Real-time analytics

4. Networking Services

7. Amazon VPC (Virtual Private Cloud)

Amazon VPC lets you create a private network inside AWS.

You can control:

IP addresses
Subnets
Routing
Security

Components

Subnets – Divide the network into smaller sections
Route Tables – Control traffic routing
Internet Gateway – Enables internet access
NAT Gateway – Allows private instances to access the internet

Example Use Cases

Secure application hosting
Enterprise network architecture
Multi-tier applications

8. Amazon Route 53

Amazon Route 53 is a Domain Name System (DNS) service.

It converts domain names into IP addresses.

Example:

www.example.com → 192.168.1.1

Features

Domain registration
DNS routing
Health checks
Traffic routing policies

Routing Policies

Simple routing
Weighted routing
Latency routing
Failover routing

9. Amazon CloudFront

Amazon CloudFront is a Content Delivery Network (CDN).

It delivers content from servers closest to users to reduce latency.

Key Features

Global edge locations
Fast content delivery
Security integration
Supports dynamic and static content

Example Use Cases

Video streaming
Website acceleration
Software distribution

5. Security Service

10. AWS Identity and Access Management

IAM controls who can access AWS resources and what actions they can perform.

Key Components

Users – Individual accounts
Groups – Collection of users
Roles – Temporary access permissions
Policies – Permission rules written in JSON

Example

You can allow a user:

Read access to S3
No access to EC2

Importance

IAM is the foundation of AWS security.

6. Monitoring Service

11. Amazon CloudWatch

Amazon CloudWatch is used to monitor AWS resources and applications.

It monitors

CPU usage
Memory
Network traffic
Logs
Application metrics

Key Features

Metrics – Performance data
Logs – Application logs
Alarms – Automatic alerts
Dashboards – Visualization of system health

Example

If CPU usage > 80%:

CloudWatch triggers alarm
Auto Scaling launches new EC2 instance

Quick Architecture Example

Typical AWS web application:

User
  ↓
Route 53 (DNS)
  ↓
CloudFront (CDN)
  ↓
EC2 / Lambda (Application)
  ↓
RDS / DynamoDB (Database)
  ↓
S3 (File Storage)

Monitoring:

CloudWatch

Security:

Networking:

Summary

Category	AWS Services
Compute	EC2, Lambda
Storage	S3, EBS
Database	RDS, DynamoDB
Networking	VPC, Route 53, CloudFront
Security	IAM
Monitoring	CloudWatch