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First you will need to publish your Tableau dashboard to Tableau Server/Online or Public. From this you will be able to obtain a link to embed within any other application.
Here is an example of a viz in Public, if you select "share" then you will obtain an embed code:
For the Server options you will require a special license which enables a guest account. This is so that the viz is always live and people do not have to sign-in to see it.
Let me know if this helps.