Network Security Groups (NSGs)

Network Security Groups (NSGs) are virtual filters used in cloud environments, such as Azure, to control network traffic to and from resources like virtual machines. Think of an NSG as a set of rules that act like security guards, allowing or blocking data based on specific criteria such as IP addresses, ports, or protocols. They help protect cloud assets by ensuring only authorized traffic reaches or leaves your resources, enhancing security without requiring physical hardware. NSGs can be applied at different levels, like individual VMs or entire subnets, to tailor security based on needs.