This guide explains how to create a Neon branch for every Qovery preview environment. Preview environments allow developers to build features in parallel without affecting each other and enable frequent small releases. Neon, a fully managed serverless Postgres, addresses the challenges of working with preview environments by enabling isolated copies of data on demand. The integration process involves creating a project in Neon, setting up lifecycle jobs in Qovery, and configuring environment variables for the lifecycle job.