Glossary: Group-buying websites
Set up to offer people discounts on a wide range of goods and services with the size of the discount dependent on the number of people who sign up for it. To purchase any of the deals on offer, you have to register your payment details with the site and when you see a deal you like, commit to buy it. Once the offer has reached the required number of sign-ups, your card is charged and you are sent an email with redemption instructions. If too few people sign up for that particular deal, you are not charged. Every group-buying website’s terms and conditions differ, so check them out before signing up.