# Introduction

NATS is simple and secure messaging made for developers and operators who want to spend more time developing applications than worrying about a messaging system.

* Easy to use for developers and operators
* High-Performance
* Always on and available
* Extremely lightweight
* At Most Once (NATS) or At Least Once Delivery (NATS Streaming)
* Common Messaging Pattern Support
* Client support for over 30 different programming languages
* Cloud Native, a CNCF project with Kubernetes and Prometheus integrations

NATS is used for:

* Cloud Messaging
* Microservices
* Command and Control
* Service Discovery
* Event Streaming
* IoT and Edge
* Telemetry / Sensor Data
* Mobile and Big Data
* Augmenting or Replacing Legacy Messaging