The Recall plugin brings spaced repetition to Obsidian, allowing users to track and review notes based on customizable algorithms. You can choose from algorithms like Anki, SM2, or Leitner, each with different methods for scheduling review intervals. The plugin helps improve retention by automating review processes, and it offers flexible tracking of notes without requiring manual changes. Users can also set hotkeys for quick access to review commands and visualize their progress through a status bar. It's an ideal tool for those looking to incorporate spaced repetition into their Obsidian workflow for efficient learning and memory retention.