The World Wide Web is about communication between web clients and web servers.
Clients are often browsers (Chrome, Edge, Safari), but they can be any type of program or device.
Servers are most often computers in the cloud.
Communication between clients and servers is done by requests and responses:
A typical HTTP request / response circle:
All browsers have a built-in XMLHttpRequest Object (XHR).
XHR is often used to request and recieve data for the purpose of modifying a web page.
The XHR Object is a Web Developers Dream, because you can:
The XHR Object is the underlying concept of AJAX and JSON:
SSL (Secure Sockets Layer) is the standard security technology for establishing an encrypted link between a web server and a browser. This link ensures that all data passed between the web server and browsers remain private and integral. SSL is an industry standard and is used by millions of websites in the protection of their online transactions with their customers.
npm is the world's largest Software Registry.
The registry contains over 800,000 code packages.
Open-source developers use npm to share software.
Many organizations also use npm to manage private development.