The document introduces the Amazon Appstore, a digital distribution platform for mobile apps. It discusses why customers should use the Appstore to access over 400,000 apps at discounted prices, and why developers should join to reach customers in over 236 countries and territories while taking advantage of Amazon's payment and marketing services. Developers can get started by registering for free on the Amazon developer website and submitting their app, which often takes less than 30 minutes.