This document discusses spec-driven development, which involves writing specifications for features in human-readable form, translating those specs into code (such as tests), and then writing code to fulfill the specs. An example spec is provided for a product tour feature. It explains that specs define what a user should see to satisfy a business need. The document also provides an example of developing a natural language to SQL query translator, writing specs for the basic flows and types of queries it should support before writing code to implement those specs.