A crisis website is a platform specifically designed or launched in the context of an emergency situation requiring rapid and effective communication. These sites are of paramount importance during a crisis because access to information for the general public and the media is now primarily via the internet. There are two approaches to creating crisis websites: some are developed proactively in anticipation of foreseeable crises, while others are developed urgently when a crisis occurs.

These sites can be set up on behalf of a company, a professional association, or a government entity. To ensure optimal control of the information disseminated, it is often recommended to accompany the creation of a crisis website with a paid search engine marketing (SEM) campaign. The technical aspect of the infrastructure of such a site is crucial, as significant traffic spikes can occur during crises, requiring adequate management and processing capacity.