It adds the waitlist functionality to your online web store. If a product is out of stock, then it notifies the buyer via email when the product gets available. This is a nice way to notify the buyer so that he can come back to store and purchase the product when it is back in stock. The user can join the waitlist just by one click. The configuration of the plugin is very easy.
This is the EXACT same plugin as distributed by the developer on WooCommerce. The developers’ links are provided above.