What is the difference between crawling, parsing and scraping?

What is the difference between crawling, parsing and scraping?

As per usual, Wikipedia provides pretty good definitions for Web crawler,Web scraping, and Parsing. Scraping usually comes before parsing, though scraping and parsing may be used interchangeably. Crawling and scraping are also often used interchangeably.
· Crawling is essentially following links, both internal and external.
· Scraping is the act of extraction, for instance from crawling.
· Parsing is basically breaking it down into pieces, constituent parts, or segments.