The Title index plugin allows users to automatically add numbered indexes to markdown headings in their Obsidian notes. This feature helps organize and structure documents by providing hierarchical numbering for headings (e.g., 1.1, 1.2.1). It streamlines navigation and readability, making it easier to manage and reference complex content. The plugin can be activated through the command palette and ensures that headings are consistently numbered without affecting code blocks or other non-heading elements in the document.