With deploying a Mendix app to the cloud you have got several option:
https://docs.mendix.com/developerportal/deploy/index#1-introduction
The most common would be to deploy to the Mendix cloud, either a licensed version or the free app:
https://docs.mendix.com/developerportal/deploy/mendix-cloud-deploy#1-introduction
What is the process to to deploy free app to the cloud.
It is described here: https://docs.mendix.com/developerportal/deploy/mendix-cloud-deploy#5-deploying-a-free-app-to-the-mendix-cloud