Publishers prepare and issue magazines for sale. They control editorial content and design and manage advertiser relationships, which provide 40-100% of revenue. Magazines are distributed from printers to regional distributors and shops via lorries. Any unsold copies can be returned by retailers with no cost under the "sale or return" system. Freemium magazines are given out for free with revenue from ads, while subscriptions allow regular postal or electronic delivery of issues. Magazines also have online presences like websites, ezines, apps, and social media to extend their brands.