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There is no better time to learn Spark than now. Spark has become one of the critical components in the big data stack because of its ease of use, speed, and flexibility. This scalable data processing system is being widely adopted across many industries by many small and big companies, including Facebook, Microsoft, Netflix, and LinkedIn. This chapter provides a high-level overview of Spark, including the core concepts, the architecture, and the various components inside the Apache Spark stack