WooCommerce Waitlist is a handy plugin that lets shoppers register their interest in out-of-stock products, then automatically notifies them by email when stock is replenished. It's perfect for online store owners running busy WooCommerce shops who want to retain potential customers rather than lose them to competitors. The plugin integrates neatly with WooCommerce's existing inventory management and supports variable products, making it a genuinely useful tool for reducing lost sales and keeping customers engaged.