Data Warehouse

A data warehouse is a central database designed to collect data from many sources and serve analytics — the place a company keeps clean, organized, query-ready data for reporting and decision-making. It stores structured data (neat tables with defined columns and types) and is built so analysts can ask big questions with SQL and get fast answers.

In practice a warehouse is the heart of the analytics setup: sales data, marketing data, and product logs all flow in, get tidied up, and live together so teams can join them. The trade-off is that everything must be modeled into tables first; raw, messy, or unusual file types (images, free text, sensor dumps) often go to a data lake instead. Common modern warehouses include Snowflake, Google BigQuery, and Amazon Redshift.