PubNub Guides
![MQTT.jpg MQTT.jpg](https://www.pubnub.com/cdn/3prze68gbwl1/Nay77mWNf164ri9R91ZSn/b01931b2acc5f3624a04bade39a48357/MQTT.jpg?w=360&h=200&fit=)
What is MQTT?
MQTT (Message Queuing Telemetry Transport) is a lightweight messaging protocol for efficient real-time communication between devices.
![Server-Sent Events-Guide.jpg Server-Sent Events-Guide.jpg](https://www.pubnub.com/cdn/3prze68gbwl1/775FfVFcju7ApWDrQg3WDY/20f4d9ccdee1cf98a913ff9efa82a748/Server-Sent_Events-Guide.jpg?w=360&h=200&fit=)
What are Server-Sent Events (SSE)?
Server-Sent Events (SSE) is one technology approach that allows backend servers to push real-time client updates over a single HTTP connection.
![WebSockets.jpg WebSockets.jpg](https://www.pubnub.com/cdn/3prze68gbwl1/2IHYNaaDwRcSP9s4zFnnF3/b6a900741fa8c0b09ff2053f7e893661/WebSockets.jpg?w=360&h=200&fit=)
What are WebSockets?
In this guide, we discuss WebSockets and other types of client-server connections.
![HIPAA Compliant App.png HIPAA Compliant App.png](https://www.pubnub.com/cdn/3prze68gbwl1/3casBapBq6acI5D2c1pqYt/aef682ac60993a1fb22cd48ab14f7f91/HIPAA_Compliant_App.png?w=360&h=200&fit=)
What is a HIPAA-Compliant App?
App development for building and launching healthcare applications is different from other industries. Why? Compliance and security.
![What is a Real Time Messaging App - Guide.jpg What is a Real Time Messaging App - Guide.jpg](https://www.pubnub.com/cdn/3prze68gbwl1/3FWLdJxcSsgdsx2qlKbM5I/529b96798a6a8327d70b1b2687c41034/What_is_a_Real_Time_Messaging_App_-_Guide.jpg?w=360&h=200&fit=)
What are Real Time Messaging Apps?
This guide will explore real-time messaging in-depth, covering how you can use it to bring responsive, dynamic connectivity to your users.
What is a Virtual Events Platform?
In this guide, we’ll cover the core features and benefits of building a virtual event platform to host your next virtual or hybrid event.
What is Presence?
User presence is an essential feature when building an engaging, real-time virtual experience.
![Simple Notification Service (SNS) -Guide.jpg Simple Notification Service (SNS) -Guide.jpg](https://www.pubnub.com/cdn/3prze68gbwl1/2bSJt5PO610lsIaU2K8BYr/51e0d50e78ced0de0b1459227884c672/Simple_Notification_Service__SNS__-Guide.jpg?w=360&h=200&fit=)
What is Simple Notification Service (SNS)?
SNS is a fully managed messaging service that enables you to send notifications to various endpoints or distributed systems.
![Fan out software.png Fan out software.png](https://www.pubnub.com/cdn/3prze68gbwl1/7zdmq7b8hloJEezN3e6g8h/bd2189899e48257c9503b90a204540d7/Fan_out_software.png?w=360&h=200&fit=)
What is Fan-Out Software?
Fan-out messaging examples and use cases.