This document discusses Lightning Connect in Salesforce, which allows for real-time access to external data without extracting, transforming, and loading (ETL) the data into Salesforce. It provides an overview of when Lightning Connect is recommended and the differences between external objects and custom objects. The document then demonstrates how to set up an external data source, create external objects and fields, define relationships between external and standard objects, and enable user access. It also demonstrates integrating external data by configuring relationships and customizing the display of external data on pages and in the Salesforce1 mobile app.