_20_SOURCE is a DZ root zone. It is storage architecture, not a website section.

PurposeSource code, scripts, projects, automation, and samples.
Use ForRunnable and buildable logic: PowerShell scripts, JavaScript projects, local tooling, project source, and source samples.
Do Not Use ForRun artifacts, one-off outputs, durable media collections, or quarantined material.
Current Top-Level Examplesartifacts, projects, samples, scripts