JIRA uses issue types to define the purpose of issues, while the JIRA Service Desk uses request types for the same purpose. In fact, each request type is mapped to an issue type behind the scenes. The one key difference between the two is that, a request type is what is shown to the customers, and a more descriptive display name is used. For example, an issue type is called Incident, and the corresponding request type will be called Report system outage. You can think of request types as issue types with a fancy display name.
To create a new request type for your service desk:
Browse to the service desk you want to create a new request type for.
Select the Settings tab and then Request Types from the left.
Click on the icon to select a new icon for the request type.
Enter a name for the request type. You can be as descriptive as possible with its name, so your customers can easily understand its purpose.
Select the issue type that the request type is mapped...