Is product development and brand management more o

[slice2020]

Both are pretty vague and have to do with marketing.
Brand management involves everything to do with a specific brand or family of products. It Management can include product development for that brand.
Product Development is about developing new products. It's not specific to a brand though it could be.
It depends on the company that you are talking about.

[abieadam]

Public relations also plays a vital role for the new product launch..
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How to Plan A Product launch