target audience
US /ˈtɑːrɡɪt ˈɔːdiəns/
UK /ˈtɑːrɡɪt ˈɔːdiəns/

1.
the particular group of people at which a film, book, advertising campaign, etc., is aimed.
:
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The marketing team identified teenagers as their target audience for the new app.
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Understanding your target audience is crucial for effective communication.