When you launch a Kickstarter campaign, you must set a fundraising goal, which should reflect the minimum amount of money that you need to bring the project to life.
If you hit that target before the campaign’s duration runs out, then you will be able to keep the funds that have been pledged by backers, and proceed to fulfill the promised rewards. If you don’t hit your goal, none of the backer’s credit cards will be charged.
However, what happens if you hit your crowdfunding goal when there is still time left before your campaign ends? This is where stretch goals come in.
Read the full article here: http://www.crowdcrux.com/kickstarter-stretch-goals/