e0279ba3_ew___Spark_1_4_1_Documentation__Meaning
[Term] Application jar [Meaning] 
A jar containing the user's Spark application. In some cases users will want to create an "uber jar" containing their application along with its dependencies. The user's jar should never include Hadoop or Spark libraries, however, these will be added at runtime.
Cluster Mode Overview - Spark 1.4.1 Documentation
Meaning