Chronologie du XXe Siècle is a French-language historical reference site focused on the events and conflicts that shaped the twentieth century. Its central resource is an expanding collection of timelines, with entries organized by year, day, country, organization, and war. Visitors can explore major subjects including the First and Second World Wars, the Cold War, the Balkan Wars, the Yugoslav conflicts, and the development of the European Union.

Dedicated sections also provide lists of people, political parties, trade unions, names, localities, acronyms, publications, websites, and bibliographic material, including books and articles. The site presents history as a way to understand the present and notes that dates and information are regularly added as research continues. Navigation includes introductory and reference sections, contact and account options, and a shop area with a basket and checkout.

It also invites visitors to discover featured historical topics and promotes access to its full content without limits. Chronologie du XXe Siècle serves readers seeking structured, browsable information about modern European and world history