AWS private vs public services

What Does "AWS Public Service" Mean?

An AWS Public Service refers to an AWS service that is accessible over the public internet, meaning it does not require a private network (VPC, Direct Connect, VPN) to access it. These services can be used by anyone with an internet connection and appropriate permissions.

Examples of AWS Public Services

Public AWS Service	What It Does	Why It's Public
Amazon S3	Object storage for files & data	Can be accessed via public URLs (if permissions allow)
AWS Lambda	Serverless compute service	Does not require a VPC, runs in AWS-managed infrastructure
Amazon DynamoDB	NoSQL database service	Internet-accessible, no need for private networking
Amazon CloudFront	Content Delivery Network (CDN)	Serves cached content globally via public endpoints
Amazon SNS	Pub/Sub messaging service	Can send notifications over the internet (email, SMS, etc.)
Amazon API Gateway	Manages and hosts APIs	Public-facing by default unless restricted
AWS IAM	Identity & Access Management	Accessible globally for user authentication

Non-Public AWS Services (Private Services)

Some AWS services must be used inside a VPC or private network, meaning they are not directly accessible from the public internet.

🔒 Examples of Private Services:

Amazon RDS (Relational Database Service) – Runs inside a VPC by default.
Amazon EC2 (Elastic Compute Cloud) – Instances are inside a VPC, only public IPs are accessible.
Amazon Elastic Load Balancer (ELB) – Private-facing ELBs require VPC access.
AWS Direct Connect – Private network connection from on-premises to AWS.

Analogy: Public vs. Private AWS Services

AWS Public Services = A public library 📚 – Anyone can walk in and access books.
AWS Private Services = A private office building 🏢 – Only authorized employees can enter.

Key Takeaways

✅ Public AWS Services are internet-accessible but still require authentication.