MailChimp is an app for email marketing. This action allows you to connect the form with the MailChimp service. The data that users insert into the form will be transferred to the application, and you will be able to use it there.
To create a connection between the form and the MailChimp app, you will need to get the MailChimp API key. Insert it into the API Key bar and press the “Validate API Key” button.If you need a helping hand, go through this API key obtaining tutorial.