While some people use these terms interchangeably, some differences exist from provider to provider. A CISO-as-a-Service is an outsourced solution that typically provides both cyber security leadership as well as a team of experienced resources. A vCISO is also an outsourced service, but generally provides only the CISO or security leader. A fractional CISO is usually an in-house resource that splits their time between security leadership and other tasks. For a more in-depth look at each of these terms, check out our blog on fractional CISOs.