Amazon Audible lets you stream its expansive library of audiobooks, podcasts, and more. How it works.

• Amazon bought Audible in 2008, and now it's a major player in audiobooks.
• The subscription service provides a library of audio content at different price tiers.
• Users who want "premium" content must pay more for their Audible subscription.

Audible, which began as a standalone portable media player in 1995, came underneath the Amazon umbrella when the company purchased it in 2008. Since the acquisition, Amazon has propelled it to domination of the US audiobooks market.