Definition Access:
Access refers to users being allowed to use an IT service. This can refer to running an application,
viewing a web page or dataset, logging on to a computer with special applications on it,
physically entering a room or wing of a building, and so on.

Definition Rights:
Rights are the permissions that users or roles have in relation to an IT service. Rights can also
be called privileges. Rights are a fundamental concept in Access Management concerning
many different kinds of security, whether physical security, network security, application security,
and so on.

Definition identity:
An identity is a unique name used to label and distinguish a user or role from other users or
roles. This identity is then used to grant or revoke rights. An identity is separate from an
employee’s personal name because those are not always unique.

Definition service group:
A service group is a collection of services that are bundled, and access to these bundles is
given to individuals. It is easier to grant access to shared services this way than it is to allow
access by one service at a time.

Definition Access mngt:
Access Management is the process that grants the right to use an IT service. Some organizations
refer to it as “rights management” or “identity management,” but it amounts to the same thing: authorizing and revoking users as they try to use an IT service.

ITIL