Criticality is the degree of impact of missing something important, e.g., critical process, activity, resource, or system. Criticality analysis is the process of determining the criticality.
Business impact analysis (BIA) that comprising criticality analysis identifies
critical activities that support the delivery of products and services,
supporting activities and dependencies, and
other assets and resources.
The more critical an activity is, the shorter its tolerable downtime is. BIA identifies activities and determines their MTDs, RTOs, and RPOs to prioritize them as critical activities. In summary, criticality analysis is part of BIA.