SCP - The basics

Special Containment Procedures
Commonly known as SCPs , can be an object, place, person, animal or even an occurance almost always with anomalous or paranormal properties . They are given an Item number as SCP-XXX and categorized. SCPs are grouped into 1 of 3  threat level classes ... they are as follows.

Safe -  The designation "Safe" is assigned to subjects or objects that may be effectively and reliably contained. Safe designates that the SCP may have individual containment procedures, but these procedures are not expected to fail frequently, or be subject to later revision as more information is obtained about a subject. Some well known SCP's with this designation are " SCP-1981", " SCP-914" and " SCP-1733".

Euclid - An SCP object is classified as Euclid when its behavior cannot be unerringly predicted, either because the item is sentient, it behaves out   of current scientific knowledge, or its nature is simply poorly understood at present. Euclid-class objects do not pose the same existential threat to humanity that Keter-class objects do, but they still generally require more diligence to keep contained than Safe-class objects. Some well known SCP's with this designation are " SCP-173", " SCP-087" and " SCP-093".

Keter -  The designation "Keter" is assigned to subjects that both (a) display vigorous, active hostility to human life, civilization, and/or spacetime, and (b) are capable of causing significant destruction in the event of a containment breach. Such subjects must be catalogued, contained according to special containment procedures, and destroyed, if possible. Some well known SCP's with this designation are " SCP-682", " SCP-106" and " SCP-610".
Anyone may draw up an SCP protocol on any Item and add it to 'The List,' but every author is subject to review by his or her peers, and must adhere to the high standards and clinical approach mandated by his fellows. These articles are overview reports of individual 'Items' in containment by SCP personnel and facilities. They quickly summarize threats and describe Items with only necessary details (as time might be short on hand in the event of a containment breach or other event).

All items are controlled and contained at various sites owned by the SCP The Foundation.  Unlike the name of the items contained - The "SCP" in the title of the foundation stands for "Secure, Contain, Protect".

Clandestine and worldwide, The SCP Foundation operates beyond jurisdiction, empowered and entrusted by every major world government with the task of containing 'items which jeopardize normalcy.'
Many of the items, - pose both a physical danger to people and a psychological mistrust in worldly affairs, their personal beliefs, and an interruption to daily life.

The foundations goals are as follows ..
+ Observe preternatural phenomena and develop new theories of science based on their observable behaviour.
+ Contain potentially dangerous phenomena.
+ Develop safety procedures for dealing with all future phenomena.
+ Observe, detain, and destroy any one or anything preventing us from accomplishing the previously stated goals