Explanation : Cloud Dataflow uses a Source of information, a series of PCollections that hold data, and a Sink, where the data will be stored or sent. PCollections are the input and output of every transform operation
Explanation : Google provides quick start templates for Cloud Dataflow to allow you to rapidly deploy a number of useful data pipelines without requiring any Apache Beam programming expertise
Explanation : BigQuery is a fully managed data warehouse and analytic engine. The user will never have to build servers or manage storage to make use of BigQuery.