secure (adjective): able to be trusted, safe, or reliable.
The Secure Web is a technology platform.
What some specialists might be tempted to colloquially call a “tech stack”.
The Secure Web is a technology platform that is oriented towards trustworthiness of the platform for the individual using it.
The Secure Web is similiar to, and a variant of, the (classic) Web technology platform.
The Secure Web is an evolution of the (classic) Web technology platform, but with trustworthiness of the platform in mind.
Programmers, and other specialists, who are familiar with software development, applicaion development, and product development using Web technologies, will find the Secure Web familiar.
That means that these programmers, and other specialists can use many of the same programming languages, programmer libraries, file data formats, etc, that they make use of when targeting Web for the Secure Web also.
For a platform to be secure is must be trustworthy.
For many if not most people, if there is no privacy then there is no trustworthiness.
Part of having a trustworthy system is for a user to be able to make his or her actions, and presence private to some degreee when he or she chooses to.
(Which can also include a user deciding not to be private at all, if that is what the user so chooses.)
The (classic) Web did have some ability for being decentralized, and being distributed.
However, there were important ways for which the (classic) Web could not be decentralized, or distributed.
The Secure Web has tried to fix many of these deficiencies to evolved into more of a Decentralized Web, or Distributed Web.
“When devices on a network can automatically communicate, advertise, and discover services for themselves, things become possible that simply wouldn't happen if humans had to configure everything manually.” -- Daniel H. Steinberg, Stuart Cheshire
Zero Configuration Networking is a set of technologies, based on top of the Internet Protocol (IP) suite, that can automatically communicate, advertise, and discover services for themselves.
Zero Configuration Networking is also often just called “zeroconf”.
“The three technologies that make Zeroconf work are link-local addressing, Multicast DNS, and DNS Service Discovery.” -- Daniel H. Steinberg, Stuart Cheshire
“Understanding how link-local addressing and Multicast DNS work is valuable background information, but when it comes to actual programming, most programmers will interact with Zeroconf through the DNS Service Discovery APIs in their chosen language.” -- Daniel H. Steinberg, Stuart Cheshire
“With Zeroconf, you browse for services, not for hardware. […] The important principle here is that when you're looking for services on the network, the relevant question is not "What are you?" or even "What do you do?" but "Do you speak my language?" ” -- Daniel H. Steinberg, Stuart Cheshire