Scraping, as it's usually referred to in this industry, is scripts created for the sole purpose of pulling data from websites usually on a large scale. You could scrape google results for a specific niche for prime link spamming, you could scrape videos on youtube for your site in a specific niche, you could scrape keywords to load into an advertising platform, you could scrape ads in a certain demographic to "model" after...there's really and endless amount of things you could do with a good scraper.