SCP creatures are not real in the sense that they do not exist in the physical world. They are fictional entities created by the online collaborative fiction project known as the SCP Foundation.

The SCP Foundation is a community-driven creative writing project that originated on the internet forum 4chan in 2007. The project is based on the premise that there is a secret organization called the SCP Foundation that contains and studies anomalous objects, entities, and phenomena that defy scientific explanation. These objects are assigned an SCP number and are cataloged in a database that is accessible to Foundation personnel.

The SCP Foundation has produced a vast catalog of anomalous objects, entities, and phenomena, many of which are classified as SCP creatures. These creatures range from harmless anomalies like SCP-999, a gelatinous creature that exudes a calming effect, to dangerous and destructive entities like SCP-682, a reptilian creature that is virtually indestructible.

SCP creatures are typically described in great detail in their SCP files, which include information on their appearance, behavior, abilities, and containment procedures. Some SCP creatures have also been featured in stories and artwork created by the SCP Foundation community.

While SCP creatures are not real in the physical world, they have become a popular subject of online fiction and fan art. The SCP Foundation has also inspired a number of video games, podcasts, and other media.