Looker is a business intelligence and data visualization platform that enables users to explore and analyze data from various sources. It allows users to create, share and collaborate on interactive data visualizations, dashboards, and reports. Looker provides a web-based interface that allows users to connect to various data sources, create a data model, and perform data analysis. It also allows users to create custom calculations and data transformations, and share insights with others through the platform. Looker is known for its flexibility and scalability and it can be used for a wide range of use cases including data discovery, reporting, and decision-making.