# Using job templates
<a name="job-templates"></a>

A job template stores values that can be shared across `StartJobRun` API invocations when starting a job run. It supports two use cases:
+ To prevent repetitive recurring `StartJobRun` API request values.
+ To enforce a rule that certain values must be provided via `StartJobRun` API requests.

Job templates enable you to define a reusable template for job runs to apply additional customization, for example:
+ Configuring executor and driver compute capacity
+ Setting security and governance properties such as IAM roles
+ Customizing a docker image to use across multiple applications and data pipelines

The following topics provide detailed information on using templates, including how to use them to start a job run and how to change template parameters.

**Topics**
+ [Create and using a job template to start a job run](create-job-template.md)
+ [Defining job template parameters](use-job-template-parameters.md)
+ [Controlling access to job templates](iam-job-template.md)