What is Crowdfunding, and give Advantages and Disadvantages for it

-Simply a Way of Raising Money, by getting Attention to your Funding and having Small Investments, which Adds Up A: Very Cheap Source of Investment A: Large Internet Grounds, like Social Media, can be used to Attract Large Amounts of Finance, and also Update the Investors of the Progress and Benefits D: Investors want something to be Offered Back to them, meaning the Control may be Threatened D: There is a Limit of the Number of Investors, so therefore the Amount D: The Idea may just Suck and attract No One meaning a Waste of Time