What is Network Security Groups?

Network Security Groups (NSGs) are a fundamental component of network security, primarily used in cloud environments like Microsoft Azure. They act as virtual firewalls, controlling inbound and outbound network traffic to and from Azure resources (e.g., virtual machines, virtual networks, subnets). NSGs contain security rules that allow or deny network traffic based on factors such as source and destination IP addresses, ports, and protocols. They are commonly used to isolate resources, implement security policies, and protect against unauthorized access and network attacks.