Apache Spark is an open-source cluster-computing framework. It is a fast and general-purpose engine for large-scale data processing. It provides high-level APIs in Java, Scala, Python and R, and an optimized engine that supports general execution graphs.
For example, Spark can be used to process large amounts of data from a Hadoop cluster. It can also be used to analyze streaming data from Kafka, or to process data from a NoSQL database such as Cassandra. Spark can also be used to build machine learning models, and to run SQL queries against data.