# Ordinary Business Questions
# What is EMQ X ?
EMQ X (Erlang/Enterprise/Elastic MQTT Broker) is an open source IoT MQTT server developed on the Erlang/OTP platform.
# What is EMQ X Cloud？
EMQ X Cloud is the EMQ X online SaaS provided by the EMQ team.
Over the past few years, EMQ has provided mature MQTT middleware and IoT platform related support services to customers, during which we have accumulated rich practical experience in IoT platform design, operation and maintenance management. Based on this, we have launched EMQ X Cloud, a public cloud service for IoT platforms, providing EMQ X access platform services with one-stop O&M escrow and a unique isolated environment.
EMQ X Cloud provides secure and reliable bi-directional communication between applications and devices, supporting massive device connectivity in large clusters while providing other value-added capabilities such as device management, rules engine, data persistence and Kafka data bridging, covering various IoT application scenarios and retaining the ability to customize and expand.
# What is the relation between EMQ X Cloud and EMQ X Enterprise？
EMQ X Cloud is an EMQ X Enterprise cluster hosted by EMQ. Customers can scale based on their demands.
# Which platforms does EMQ X Cloud support?
AWS, Azure, Google Cloud Platform。