Hello @Arman Bhati
Welcome to the Atlassian community.
This website, where you posted your question, is a website where questions, discussions, and articles can be shared about the Jira product made by Atlassian.
The simplest explanation for the Jira products is that they are software products that are used for tracking work items. You can buy a license to install the product on a sever you manage or you can subscribe to the product as a software-as-a-service product where it is installed on infrastructure owned and managed by Atlassian.
If you want more high level information about these products and the others offered by Atlassian then I recommend that you visit their website at https://atlassian.com
If you want to access free training to learn more about how to use the products then I recommend you visit https://university.atlassian.com
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