What Is The SCP Foundation (SCP-001 "The Gatekeeper" Animation)

You asked for more SCP, so here you go! A strange nightmare woke me up in the middle of the night. Since I couldn't fall back asleep, I decided to walk to the nearby gas station to grab a snack. That's when a white van pulled up and next thing you know... I'm being held in an underwater secret base. A scientist introduces me to the SCP Foundation, an organization that's dedicated to securing, containing and protecting various anomalies aka unexplained phenomenons. It was all so crazy, I thought I was still dreaming but that's when I learned that... It was never a dream at all...