The dark web is a series of encrypted networks that exist on the internet, and it is often used for nefarious purposes such as the sale of illegal drugs and weapons, and the distribution of child pornography. As a result, the dark web is often associated with criminal activities and is widely considered to be illegal. However, the legality of the dark web depends on the jurisdiction and the activities conducted within it.

In the United States, accessing the dark web is not illegal in and of itself, as there are legitimate and lawful uses for it. For example, journalists and political dissidents often use the dark web to protect their anonymity and safeguard their sensitive data from government surveillance. Furthermore, many companies use the dark web to protect confidential data from hackers. In these cases, the use of the dark web is not illegal.

However, the dark web is primarily used for illegal activities such as the sale of illegal drugs, weapons, and stolen data. The possession and sale of these items are illegal in the United States, and thus, the dark web is often considered to be a criminal marketplace. Furthermore, the use of the dark web to facilitate criminal activities such as money laundering and human trafficking is illegal in the United States and most other countries.

In conclusion, while the dark web is not necessarily illegal, it is primarily used for illegal activities and is therefore strongly associated with criminal activity. As a result, law enforcement agencies around the world are actively monitoring the dark web in order to stop criminal activities.