# Variables

You can use the REST API to create and manage your Octopus [variables](/docs/projects/variables). Typical tasks can include:

- [Add variable set to a project](/docs/octopus-rest-api/examples/variables/add-library-set-to-project)
- [Add or update project variable](/docs/octopus-rest-api/examples/variables/add-update-project-variable)
- [Clear sensitive variables](/docs/octopus-rest-api/examples/variables/clear-sensitive-variables)
- [Find projects using variable set](/docs/octopus-rest-api/examples/variables/find-projects-using-library-set)
- [Find variable usage](/docs/octopus-rest-api/examples/variables/find-variable-usage)
- [Find variable value usage](/docs/octopus-rest-api/examples/variables/find-variable-value-usage)
- [Find variable set variables usage](/docs/octopus-rest-api/examples/variables/find-variableset-variables-usage)
- [Update variable set variable value](/docs/octopus-rest-api/examples/variables/update-variable-set-variable-value)