Hi @Sashidharan,
That is a very open question. So I guess the answer is yes. Essentially, you would set up an Atlassian account (which may be private, or managed) and this single account would allow you to access all your Atlassian products. All of them.
As there is a lot under the hood here, have a look at this article. The referenced links will take you to all kinds of places ;-)
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