product development
US /ˈprɑː.dʌkt dɪˈvel.əp.mənt/
UK /ˈprɑː.dʌkt dɪˈvel.əp.mənt/

1.
the process of creating and marketing new products or improving existing ones
:
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Our company invests heavily in product development to stay competitive.
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The team is currently focused on the next phase of product development.