= Spark Architecture
Spark uses a master/worker architecture. There is a spark-driver.md[driver] that talks to a single coordinator called spark-master.md[master] that manages spark-workers.md[workers] in which executor:Executor.md[executors] run.
.Spark architecture image::driver-sparkcontext-clustermanager-workers-executors.png[align="center"]
The driver and the executors run in their own Java processes. You can run them all on the same (horizontal cluster) or separate machines (vertical cluster) or in a mixed machine configuration.
.Spark architecture in detail image::sparkapp-sparkcontext-master-slaves.png[align="center"]
Physical machines are called hosts or nodes.