The dark web is a part of the internet that is not indexed by normal search engines and usually requires special software to access.
It is used for both legal and illegal activity, but it has become well known because stolen data is often traded there. Usernames, passwords, credit card information, employee records, and other stolen information may appear in underground markets or discussion forums.
A company does not need to visit the dark web to be affected by it. If an employee reuses a password that was exposed in another company’s breach, criminals may test that same password against Microsoft 365, banking sites, remote access systems, and other services.
This is one reason password reuse is dangerous. A breach somewhere else can become a problem for your business.
Businesses should focus on prevention. Use unique passwords, enable MFA, monitor sign-in activity, remove unused accounts, and educate employees about phishing. Dark web monitoring can also provide useful warning signs, but it should be part of a larger security plan rather than the only defense.