This document discusses why startups choose to build on AWS. It notes that AWS allows startups to pay only for the resources they use without upfront costs, focus on their core business instead of infrastructure, and launch faster by having new IT resources available in a few clicks. This enables startups to experiment more and fail fast if ideas don't work. The document also shares statistics on the pace of innovation on AWS and lists some of the programs and resources available to help startups on AWS.