Crowdfunding is an online platform service that helps creators develop their campaigns by collecting small amounts of money from the public. As a representative form of two-sided platforms, by creating efficiencies in matching between creators and contributors, crowdfunding is gaining popularity as an alternative and sustainable financial source for different types of campaigns such as creative works, technology ventures, and social causes. Based on the crowdfunding process and the two-sided platform framework, this chapter presents the development of a Crowdfunding Participation Model. It explains how crowdfunding campaign characteristics connect campaign creators to contributors, and how contributor motivations affect their funding intention, and thus, actual funding. Finally, applications of the model and future research directions are suggested.