PubNub Guides
![What is Continuous Testing .jpg What is Continuous Testing .jpg](https://www.pubnub.com/cdn/3prze68gbwl1/2vfWYSu7LQI5Dphg03uNz/82e470866cc7d0dd9d15e51f48fa713d/What_is_Continuous_Testing_.jpg?w=360&h=200&fit=)
What is Continuous Testing?
Continuous testing is software testing throughout development, ensuring the code is continuously tested for bugs, defects, & regressions.
![Guide-to-Chat-APIs-800x348.png Guide-to-Chat-APIs-800x348.png](https://www.pubnub.com/cdn/3prze68gbwl1/Ojj4Ah5D3Mh2ReTtGRGz7/59028409c0c928c000099a76a00406ee/Guide-to-Chat-APIs-800x348.png?w=360&h=200&fit=)
What are Chat APIs?
Chat APIs offer code-based tools to empower companies to easily add real-time chat features to an application or website.
What are Vertical and Horizontal Scaling?
In the most basic terms, horizontal scaling involves scaling out, while vertical scaling involves scaling up.
![Publish:Subscribe (Pub:Sub) -Pillar Page.jpg Publish:Subscribe (Pub:Sub) -Pillar Page.jpg](https://www.pubnub.com/cdn/3prze68gbwl1/71d9rjHkFFBsROtUvPYszU/7de5ce6a2783fb193b55ebe5aa34696a/Publish_Subscribe__Pub_Sub__-Pillar_Page.jpg?w=360&h=200&fit=)
What is Publish/Subscribe (Pub/Sub)?
This guide discusses how the Publish/Subscribe method works and its advantages for real-time technology.
What is SignalR?
SignalR, a software library that utilizes traditional HTTP connections, allows real-time connectivity between servers and clients.
What is Socket.IO?
Socket.IO is cross-platform library that provides full-duplex bidirectional communication between a client and a server based on events.
![What are RESTful APIs.jpg What are RESTful APIs.jpg](https://www.pubnub.com/cdn/3prze68gbwl1/1dXBAHJpMMyM1z6FZsirfz/e0927d57ef565b44ba40a16429c36695/What_are_RESTful_APIs.jpg?w=360&h=200&fit=)
What are RESTful APIs?
A RESTful API is a set of rules and constraints that govern how web services communicate with each other over the internet.
![What is Event Driven Architecture.jpg What is Event Driven Architecture?](https://www.pubnub.com/cdn/3prze68gbwl1/6oGiGPAQOv35yCDT9OYh4K/6ef64b1c0fce0f4af7ba756bd8a510e2/What_is_EDA.jpg?w=360&h=200&fit=)
What is Event-Driven Architecture?
Event-driven architecture (EDA) is a software design pattern used in microservices or other decoupled services or apps.
What is React?
React is an open-source JavaScript library popular for building user interfaces (UI) for web and mobile applications.