What is BigQuery Data Transfer Service?
The BigQuery data transfer service is used to automatically send data from a data source to a BigQuery project on a regular basis.
When you create a new project in BigQuery, you can then either manually import data to one of its data tables, or you can automate the data transfer on a regular basis.
If you want to automate the data transfer on a regular basis (which you most likely would like to do), then you would need to create one or more data transfers for your BigQuery project:
For example, you can create a data transfer which automatically extracts data from your GA4 property and then send it to your BigQuery project on a pre-defined schedule.
Similarly, you can create one or more data transfers per data source.
So you can create one or more data transfers for Google Ads, Facebook Ads, Linkedin ads, Google Search Console etc.
So, one BigQuery project can automatically get data from several data sources on a regular basis.
Note: You cannot use the BigQuery Data Transfer Service to transfer data out of BigQuery.
How to access the BigQuery Data Transfer Service
You can access the BigQuery Data Transfer Service via the following tools: