Web scraping,
to use a minimal definition, is the process of processing a web document and extracting information out of it. You can do web scraping without doing web crawling.
Web crawling,
to use a minimal definition, is the process of iteratively finding and fetching web links starting from a list of seed URL's. Strictly speaking, to do web crawling, you have to do some degree of web scraping (to extract the URL's.)
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