Can someone tell me all about OCD? A link or an explanation would be greatly appreciated!

Can someone tell me all about OCD? A link or an explanation would be

OCD or Obsessive-Compulsive Disorder is a mental disorder where a person experiences uncontrollable, reoccurring thoughts/obsessions and/or behaviors/compulsions that he or she feels the urge to repeat over and over.

What are obsessions?
Obsessions are repeated thoughts, urges, or mental images that cause anxiety.

What are compulsions?
Compulsions are repetitive behaviors that a person with OCD feels the urge to do in response to an obsessive thought.

I got my information from nihm.nih.gov so feel free to type "nihm.nih.gov OCD" into google for more information.

Google "OCD". Read carefully.

@:) Thank you!