SiYuan Note is a personal knowledge management tool centered around privacy protection, allowing for full offline usage and end-to-end encrypted synchronization. By utilizing blocks, outlines, and bi-directional links, it helps users restructure their thoughts and enhance the efficiency of information organization and knowledge management. The product supports Markdown formatting and includes various block and inline elements to meet diverse formatting needs. Additionally, SiYuan Note offers features such as large document editing, spaced repetition learning algorithms, database management, and AI-assisted writing, making it an all-in-one note-taking application.