Kickstarter is a crowd-funding platform that enables artists and other creatives to raise funds to finance the production of a new product. A Kickstarter runs for a certain time-period and there is a specific goal of how much funds have to be raised in order to fully finance the project. There are different amounts people can choose to pledge.
Those who pledge a certain amount towards the project are called backers. Depending on the amount backers choose to pledge, they receive a specific reward.
Backers credit cards are ONLY charged at the very end of the Kickstarter and ONLY if the financial target is reached. Between launch and end date, backers are free to cancel/withdraw their pledge.