QuickBooks Online Mailchimp integration refers to the seamless connection between QuickBooks Online, a popular cloud-based accounting software, and Mailchimp, a leading email marketing platform. This integration enables businesses to synchronize customer data between the two platforms, streamlining their workflow and enhancing their marketing efforts. By integrating QuickBooks Online with Mailchimp, businesses can automatically import customer contact information, such as names, email addresses, and purchase history, from QuickBooks Online into their Mailchimp account. This eliminates the need for manual data entry and ensures that the email lists in Mailchimp are always up to date.