6. Apache Spark Explained Simply
6.1 Why Spark Exists
Why. One laptop pandas dies on 80 GB of click logs.
What. Apache Spark is an engine that can split data work across many machines (a cluster). It also runs locally in tiny mode for learning.
Beginner-honest Spark
We show what Spark is and a tiny local PySpark-style sample. We do not claim you have a live multi-node cluster in this draft. Databricks/Fabric chapters stay overview + first clicks, not production ops.