> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/release-orchestration/3.0/variable-types.md).

# Variable Types

- [Activity Variables](https://developer.harness.io/release-orchestration/3.0/variable-types/activity-variables.md): Learn about activity variables and how to scope variables to activities
- [Global Variables](https://developer.harness.io/release-orchestration/3.0/variable-types/global-variables.md): Learn about global variables and how to use them across the entire release
- [Phase Variables](https://developer.harness.io/release-orchestration/3.0/variable-types/phase-variables.md): Learn about phase variables and how to scope variables to phases