@ASHWINI GAIKWAD - Thanks for the question and using MS Q&A platform.
When you run a job on a New Job Cluster (which is usually recommended), the cluster terminates and is unavailable for restarting when the job is complete. On the other hand, if you schedule a job to run on an Existing All-Purpose Cluster that has been terminated, that cluster will autostart.
For more details, refer to Azure Databricks - Terminate a cluster and Auto termination is disabled when starting a job cluster.
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