What is JIRA is JIRA from Atlassian.com ?

JIRA JIRA is an interesting system (an Enterprise Form and Workflowsystem, must often called an Issue Tracker) - very stable and with a lot of expansion possibilities, and can be - with an onDemand instance be used for $10 a month.

Read JIRA as a holistic Form and Workflow system

An onDemand (cloud based) has some restrictions regarding plugins, as an alternative option, run the product on a "local" or cloud based server.

, now a days devided into:

Jira Work Management - Business Workflow Engine
Jira Software - Kanban, Scrum, Version and Release Management Extension - and support for Development Tools like git/BitBucket.
Jira Service Management (Jira and a lightweight frontend portal)

What makes Jira different than monday.com, clickup.com and Service Desk like FreshDesk? An extreme customization ability and a huge 3rd page landscape with Apps for almost everything. You can Use Jira for virtually everything (but it always has a cost)

Read Jira as a holistic Form and Workflow system

Now a days - Jira is 2 tings:

The Datacenter version, which differs more and more from the Cloud version. With the DC version, You have 100% control over the system.
The Cloud based Jira - has some restrictions regarding plugins, and often these are not like the Datacenter Version, theres no control over the change in Jira versions (You get upgraded automatically)

Tip

I can recommend the book here for JIRA Admins (and developers)

Also, join https://www.facebook.com/groups/473601629480315/