Crowdfunding is raising money from many people, typically via online platforms, to fund a project or business. Main types include reward based (backers get products), equity (investors get shares), donation (charitable causes), and debt (peer lending). Popular platforms include Kickstarter, Indiegogo, GoFundMe, and SeedInvest. Success factors: compelling story, realistic goals, attractive rewards, strong marketing, and regular updates. Typically campaigns run 30 to 60 days. Great for validating ideas, building community, and accessing capital without traditional loans.