The “deep web” is anything Google can’t index. Usually it means paywalled content, or content which otherwise requires a login credential to access.

For example, Google can’t index your personal Amazon purchases, because that information is on the deep web, and is not public.

The “dark web” is anything without a DNS server, or on a port other than the standard HTTP/HTTPS ports, in order to hide it.

For example, If I run an HTTP server on port 9090, the only way you could access it would be by specifying a port number as part of the URL, like so: https://www.example.com:9090/index.html. Google would not index this page, unless someone, somewhere, linked to it on the regular things Google could index.

The pages might also use an alternate DNS server you’d need to point to them, and just be an IP address otherwise.

Typically, the “dark” web use pre-shared security certificates, requires that you provide evidence that implicates you in criminal activity, before they send you a security certificate that gives you access to similar information.

The more you want to see, the more you have to incriminate yourself.

So if you want to see “snuff films”, then you have to upload a “snuff film” of your own, before they send you the security certificate to see other peoples uploaded “snuff films”.

Note: A “snuff film” is a film made to satisfy a particular paraphilia, where people can only get off sexually by seeing real people killed, on camera.

There are other things out there, like having to send them cocaine, before you get a security certificate that lets you on a site, and are allowed to buy cocaine and other illegal drugs online.

The “dark web” is not a nice place; I would steer clear.

The “deep web” is just sites like Netflix or Amazon.

If you don’t know the difference, you know what Walt Disney would say?

“You must be this tall, to ride this ride”.

Most people are not technically knowledgeable enough to even try to get on the “dark web” in any meaningful way.