The Target Word Count plugin for Obsidian introduces a writing challenge by disabling editing until a set target word count is achieved. Users can initiate tracking through the command palette, setting a specific word count goal. Progress is monitored across all documents, and deletion is restricted until the goal is met, encouraging consistent writing habits. The plugin offers commands to reset progress or stop the functionality entirely if needed. It's a straightforward tool designed to help users focus on reaching writing milestones.