Every ServiceNow instance includes many hundreds of plugins. Each contains a different part of the ServiceNow system: some provide licensable functionality, some provide integrations or additional add-ons, and some provide core platform capabilities. Together, they provide all of the native functionality of ServiceNow.
There is a wide variety of capabilities contained within plugins. This short selection gives an indication of what is available:
Approvals with e-Signatureasks for your username and password whenever you perform an approval
Coaching Loops lets your staff review how a task has been completed by using an automated framework
Email Filters helps you delete spam automatically and sort the rest into separate mailboxes
Restore Deleted Records stores deleted records as serialized XML, letting you undo some mistakes
Self Service Password Reset allows users to reset their ServiceNow password if they forget it
To see the available plugins, navigate to System Definition...