Web content that cannot be found in Google's index is considered unique content?

Question

What is the criteria for determining what unique content is? Is it content that cannot be found in Google's index? Or is there more to it?

Answer 1

Unique content:

• Is not copied from elsewhere (exact copy)
• Is not a shorter summary of other content (i.e. some content is removed but the other content remains unmodified)

Quality content that won't be affected by the Panda Algorithm:

• Is written by an author who is knowledgeable about the subject
• Offers new and unique insight into the topic
• Cites sources for its information