Each and every company has its own license model, or to put it a better way, a method whereby a company will charge customers for using its products or services. There are various types of licenses available in the market, such as, for example, named user licenses, volume licenses, and client access licenses. Service-Now, has a role-based license model. For instance, if in your company 1,000 employees are working, then all employees will have access to Service-Now as an end user, which means they are allowed to raise requests or incidents on Service-Now, but for handling all those service tickets there are one 100 IT employees and all have Service-Now ITIL role access: According to for the Service-Now licensing model, your company would need to pay for 100 licenses only.
In an IT operational environment, a requester may be referred to as an end user who can do any of these tasks:
Create, view, or modify their own request
Search service catalog
Access knowledge base
Access public pages
Undertake surveys
Set own notification preferences
View assets assigned to a user
Initiate a chat session, or access and post to live feed.
In an IT operational environment, a fulfiller may be referred to as a support group member who can perform all the tasks of a requester, as well as the following tasks:
Create, delete, and modify any record
View, create, delete, and modify any report
Perform development and administrative activities, and approve requests routed to a user
In an IT operational environment, an approver is a manager, a lead, or a high-level management person who can perform all the tasks of requesters and can also approve or deny a routed record.
In my experience, many customers don't want to purchase an approver license for various reasons.
Approval by e-mail is counted as a license. In such special cases, you can deactivate the my approval module from the self-service application so that the module won't be visible to users and can create approval e-mails for all kinds of requests with the help of e-mail templates.
As a Service-Now application administrator, you should be always careful before giving role to any user as there may be some approvals are required from higher management. This is why it's very important to know the roles in Service-Now.
Note
In my experience, many customers don't want to purchase an approver licenses due to for various reasons. Usually Approval by e-mail is not counted as license but clients contracts varies as well. In such special cases, you can deactivate the My Approval module from Self-Service Application so that the module won't be visible for users and can create approval e-mails for all kinds of requests with the help of Email Templates module.