Glossary term
What is Security Group (Security Group (virtual firewall))?
Security Group stands for Security Group (virtual firewall).
In DevOps
A rule list attached to an EC2 server that decides which ports may receive traffic, and from whom. Blocks everything inbound by default.
Learn it properly · DevOpsLesson 2: Networking Basics: IP, Ports, TCP/UDP and FirewallsHow a browser request actually finds and reaches your server. The layer Vercel hides completely, and the one you must understand before EC2 makes any sense.In System Design
A virtual firewall for cloud resources. Example: Only allow port 5432 from app servers.
Learn it properly · System DesignLesson 57: Cloud Fundamentals: Regions, AZs & ServerlessServers that once took months to order now take minutes — but the cloud has its own concepts, failure modes and surprise bills. Regions and availability zones, IaaS to SaaS, serverless and cold starts, the shared responsibility model, cost, and infrastructure as code.