What exactly is PCP? A few questions..?

I've heard of it, but I've tried researching about it and I don't fully understand. What does it do? What effects does it have on the brain/mind/body? What is another drug that it could be compared to/or that it's similar to? Is it addictive? Have you ever tried it - what was the experience like? (I won't judge you) and what type of substance does it come in? Is it smoked, is it snorted, inhaled.. or what's the most popular method? Thankyou. I'm not considering taking it, I just hear loads about it in books and just in general.. so I'm wondering what the hell it is :L