AWS Batch job definitions specify how jobs are to be run. While each job must reference a job definition, many of the parameters that are specified in the job definition can be overridden at runtime.
Some of the attributes specified in a job definition include:
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Which Docker image to use with the container in your job.
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How many vCPUs and how much memory to use with the container.
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The command the container should run when it is started.
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What (if any) environment variables should be passed to the container when it starts.
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Any data volumes that should be used with the container.
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What (if any) IAM role your job should use for AWS permissions.
