This document discusses search-based applications (SBAs) and how they differ from traditional database-driven applications. SBAs are built on a search engine backbone rather than a database, and are designed for mission-oriented information access, analysis, or discovery. The document outlines some key challenges of SBAs, including unifying multiple search interfaces and data silos. It also discusses components of SBAs like content sources, crawling, indexing, processing crawled properties into managed properties, ranking, search interfaces, and federation. SBAs are well-suited for aggregating heterogeneous content, processing large volumes of data, providing real-time information, and enabling ad hoc reporting.