One of the more popular cloud platforms in recent years has been Amazon Web Services (http://aws.amazon.com), an Infrastructure as a Service (Iaas) platform that has several categories of services, ranging from simple computational instances (Elastic Compute Cloud or EC2) to fully managed application deployment services such as Amazon Beanstalk.
Vagrant can be used with Amazon Web Services (AWS) as either an extension of a desktop computing environment, using AWS to provide more computational power and better networking than you might have available in a desktop environment, or as a way to develop and test code written to interact with other Amazon applications or data services.