The itil role enables the user to perform actions related to incident, problem, change, and configuration management. This role is part of the ITIL framework, which is a set of best practices for delivering IT services. According to the ServiceNow documentation1, the itil role can do the following:
Create and update incidents, problems, and change requests
View configuration items (CIs) and their relationships
Add comments and work notes to tasks
Approve or reject change requests
Close resolved incidents and problems
Reopen closed incidents and problems
The other roles listed in the question have different functions and permissions. For example, the procurement_user role can request and track hardware purchases2, the inventory_admin role can manage stockrooms and transfer orders3, the discovery_admin role can configure and run Discovery to populate the CMDB4, and the asset role can view and edit asset records5.
References: 1: Incident Management - Product Documentation: San Diego - ServiceNow 2: Procurement - Product Documentation: San Diego - ServiceNow 3: Inventory Management - Product Documentation: San Diego - ServiceNow 4: Discovery - Product Documentation: San Diego - ServiceNow 5: Asset Management - Product Documentation: San Diego - ServiceNow
