> ## Documentation Index
> Fetch the complete documentation index at: https://rajanand.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Spark Session

A `SparkSession` is the entry point to Spark SQL, which is the Spark module for structured data processing.\
It provides a single point of entry to interact with Spark data, and it allows you to create `DataFrame`s, register `DataFrame`s as tables, execute SQL queries, and more.

* Any spark application has to create a SparkSession or have to use an existing one.
* SparkSession is the entry point to Spark SQL.
* Before Spark 2.0, there was SparkConf and then we have different contexts like SparkContext, SQLContext, HiveContext, StreamContext etc.
* In Spark 2.0, SparkSession is introduced which is a combination of SQLContext, HiveContext, and StreamContext.