Good Question! A scraper site is a website that pulls all of its information from other websites using web scraping. In essence, no part of a scraper site is original. A search engine is not an example of a scraper site. Sites such as Yahoo and Google scrape content from other websites and index the content so you can search the index by keywords. Search engines then display snippets of the original site content which they have scraped in response to your search. Common sources for scraper sites include Wikipedia.
Because scraper sites take content from other sites without the permission of the original creators, they frequently violate copyright law. It is illegal to republish copyrighted material without the copyright holder's permission. This applies regardless of whether the material was originally published on a blog, a mailing list, ect just as much as if it were commercially published.