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Software-defined security (SDS) is a type of security model in which the information security in a computing environment is implemented, controlled and managed by security software.
It is a software-managed, policy-driven and governed security where most of the security controls such as intrusion detection, network segmentation and access controls are automated and monitored through software.
Software-defined security is typically implemented in IT environments that have minimal or no hardware-based security dependence, such as cloud computing and virtualization infrastructures. Each new device created within the environment is automatically covered and controlled under the base security policy. This also ensures that the security reach and scalability of the underlying environment moves with the increasing infrastructure/environment resources. Moreover, being software-defined and managed security, environments can be moved or migrated within other data center/IT facilities without affecting the security policy and controls in place.