# Job definition examples
<a name="example-job-definitions"></a>

The job definition examples in the following topics illustrate how to use common patterns such as environment variables, parameter substitution, and volume mounts.

**Topics**
+ [Environment variables](example-use-envvars.md)
+ [Parameter substitution](example-use-parameters.md)
+ [Test GPU functionality](example-test-gpu.md)
+ [Multi-node parallel job](example-mnp-job-definition.md)