The Astronomy Picture of the Day (APOD) website published its latest image of the day on October 25, 2026, dedicated to visualizing dark matter in a simulated Universe. As always, the image is accompanied by a brief explanation from a professional astronomer describing the nature of the depicted phenomenon. The presented picture demonstrates the results of computer modeling showing how dark matter — an invisible form of matter that cannot be observed directly, but whose gravitational effects are detected through its influence on visible matter — is distributed throughout cosmic space. Such simulations help scientists understand how the large-scale structure of the Universe forms, often called the "cosmic web": giant filaments and nodes of dark matter concentration along which galaxies and their clusters are grouped. The APOD project has existed for many years and publishes one image or photograph related to space daily, accompanying it with explanatory text. The project's archive contains thousands of such materials devoted to planets, stars, nebulae, galaxies, and other astronomical objects and phenomena. The resource also provides access to a publication calendar, an archive search system, and educational materials for a wide audience interested in astronomy. Publications of this kind, while not containing revolutionary scientific discoveries, serve an important educational function by acquainting readers with the latest achievements in modeling cosmic processes and visualizing complex astrophysical concepts, such as the structure of dark matter in the Universe.