It is a Platform as a Service (PaaS) that supports querying using a dialect of SQL.
BigQuery was announced in May 2010 and made generally available in November 2011.
[1] Bigquery originated from Google's internal Dremel technology,[2][3] which enabled quick queries across trillions of rows of data.
[4] After general availability, BigQuery found success among a broad range of customers, including airlines, insurance, and retail organizations.
[4] BigQuery requires all requests to be authenticated, supporting a number of Google-proprietary mechanisms as well as OAuth.