• The categories on youtube are based on the following pages which are:
  
• Autos & Vehicles
• Comedy
  
• Education
  
• Entertainment
  
• Film and animation
  
• Gaming
  
• How to & Style
  
• News & Politics
  
• Nonprofit's & Activism
  
• People & Blogs
  
• Pets & Animals
  
• Science & Technology
  
• Sports
  
• Travel & Events

Those are some of the options you can chose from when uploading a video or searching for a specific category.
YouTube was invented by Steve Chen, Chad Hurley and Jawed Karim out of a garage in Menlo Park they sold youtube for 1.65 billion dollars to Google. YouTube was founded in February 2005 there is no specific date. Good news recently youtube was made an app for an xbox 360 along with it being an app on many types a phones.