The deep web refers to anything on the internet that can't be found using a search engine. That includes emails in your Gmail account, direct messages on social networks, and even your Facebook photos that you marked as private.

The dark web is a sub-section of the deep web. It is responsible for the deep web's bad reputation. There are black markets selling drugs and other substances, grisly images, and even new identities and online accounts for sale. Indeed, there are lots of reasons to avoid the dark web entirely.
Yet, at the same time, the dark web is well worth exploring. Amidst the chaos, you'll find some great websites.

best are the example of darknet market
Silk Road.
Black Market Reloaded.
Sheep.
Darkwhitehouse
Darklogs.xyz
DeepBay.
Agora.
Pandora.
Evolution.
TOM.

But i will explain few.

1. Silkroad
The Silk Road was an online black market where buyers and sellers of illegal or unethical items could transact anonymously,Silk Road was an online black market and the first modern darknet market, best known as a platform for selling illegal drugs.[7] As part of the dark web,[8] it was operated as a Tor hidden service, such that online users were able to browse it anonymously and securely without potential traffic monitoring. The website was launched in February 2011; development had begun six months prior.[9][10] Initially there were a limited number of new seller accounts available; new sellers had to purchase an account in an auction. Later, a fixed fee was charged for each new seller account.[11][12] Silk Road provided goods and services to over 100,000 buyers.[13]

In October 2013, the Federal Bureau of Investigation (FBI) shut down the website[14] and arrested Ross Ulbricht under charges of being the site's pseudonymous founder "Dread Pirate Roberts".[3] On 6 November 2013, Silk Road 2.0 came online, run by former administrators of Silk Road.[15] It was also shut down, and the alleged operator was arrested on 6 November 2014 as part of the so-called "Operation Onymous". Ulbricht was convicted of seven charges related to Silk Road in the U.S. Federal Court in Manhattan and was sentenced to life in prison without possibility of parole.[1][16][17] In November 2020, the United States government seized more than $1 billion worth of bitcoin connected to Silk Road.
2. Darklogs.xyz
This website is a newly launched darkmarket where hackers get hacking tools to hack banks, buy hacked bank logging and cookies, and a software which people use to send fake bitcoin, Most people get this software in order to scam their victims, by sending them bitcoin, without the victim knowing its a fake bitcoin, the website was launched in year 2020

3. darkwhitehouse.com

This website is known as one of the secret website in the state, where mostly Americans buy fire arm, pills and all kinds of drugs.

4. Genesis.market
Genesis service is selling users' personal data, complete with digital fingerprints, such as account credentials, cookies, browser user-agent details, and more.

they are other darknet market that sells unethical items, But when accessing this website i listed above, try to protect yourself by using a vpn