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To develop a product, first you need to come up with something that consumers need, even if they don’t know it yet. Try carrying a notebook around with you and writing down any ideas as they come to you. Once you’ve thought of something great, collaborate with designers or engineers to come up with a workable prototype. Then, secure funding to actually make your prototype by crowdsourcing or reaching out to venture capitalists. After you build a prototype, test it out, and make any necessary changes, you can start marketing your product. To learn how to test a prototype of your product before selling it, scroll down!
Source: Wiki How