A security group is a collection of assets or grouping objects, such as virtual machines, Org VDC networks, or security tags.

Security groups can have dynamic membership criteria based on security tags, VM name, VM Guest OS name, or VM Guest Host name. For example, all VM's that have the security tag "web" will be automatically added to a specific security group destined for Web servers. After creating a security group, a security policy is applied to that group.