Explain what the below code does

package com.clairvoyant.spark_workshop.exercise3.java;

import org.apache.spark.SparkConf;

import org.apache.spark.api.java.JavaSparkContext;

/**

* Created by robertsanders on 11/1/15.

*/

public class Exercise3JavaSparkApp {

public static void main(String[] args) {

SparkConf conf = new SparkConf().setAppName("Exercise3JavaSparkApp").setMaster("yarn-client");

JavaSparkContext sc = new JavaSparkContext(conf);

}

}