[GitHub] [flink] infoverload commented on a diff in pull request #19107: [FLINK-12639] Expand glossary

[GitBox <gi...@apache.org>]

infoverload commented on code in PR #19107:
URL: https://github.com/apache/flink/pull/19107#discussion_r859986467


##########
docs/content/docs/concepts/glossary.md:
##########
@@ -25,182 +25,646 @@ under the License.
 
 # Glossary
 
+#### Aggregation
+
+Aggregation is an operation that takes multiple [records](#record) and aggregates them into a single 
+record using a user-provided aggregation logic (i.e. counting the number of records). When working with 
+[DataStreams](#datastream), it generally makes more sense to think in terms of aggregations over finite 
+[windows](#window), rather than over the entire DataStream, since records availability cannot be assumed 
+over time, like with traditional database systems.
+
+#### (Flink) Application
+
+A Flink application is any user program that submits one or multiple [Flink Jobs](#flink-job) from its
+`main()` method. The execution of these jobs can happen in a local JVM or on a remote setup of clusters 
+with multiple machines.
+
+The jobs of an application can either be submitted to a long-running [Session Cluster](#session-cluster),
+to a dedicated [Application Cluster](#application-cluster), or to a [Job Cluster](#job-cluster).

Review Comment:
   Would you recommend changing the definition of "application"? If so, what would be a better suggestion?



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