The Obsidian Query Language plugin allows users to query and gather information from their vault directly within Obsidian notes. By writing configurable oql code blocks, users can perform complex searches on note metadata and content, format outputs as strings, tables, or lists, and customize the appearance and sorting of results. The plugin supports advanced query capabilities, including logical operators and placeholders for dynamic outputs. It uses Fuse.js for building an index, enabling fast and flexible searches. This tool is particularly useful for users managing large vaults who need detailed, customizable queries to organize and analyze their notes.