Most online stores are losing revenue by leaving orders behind. When a customer adds products to the cart but doesn’t complete the checkout, that order is lost. Mailchimp Ecommerce automates sending out email reminders with the abandoned cart contents and tracks all recovered sales in a dashboard. It also comes with several other automations and email marketing tools.
TL;DR: It’s basically free money with hardly any dev work. Just install it and watch the recovered orders roll in.