e.v.r. wrote:
What are crawler between the parser? (Difference)
All "difference" questions are inherently incorrect. It only can be used as a figure of speech, if something is very similar. If some things have nothing to do one with another, you won't be able to define the notion of "difference". If you could, you would be able to answer "what's the difference between apple and Apple", but can you? :-)
And this is exactly the case. So, just learn what are they:
http://en.wikipedia.org/wiki/Parser[
^],
http://en.wikipedia.org/wiki/WebCrawler[
^].
The crawler has to use some parser, as its implementation detail, I guess. I depends though.
Clear enough, isn't it?
—SA