A basics question: crawl vs search

I’ve noticed that some search sets don’t use plugins, which got me to thinking about crawl vs search. Is this right – crawl will download (or attempt to) the entire site and then apply the search term, whereas search (via plugins) will use whatever engine(s) is/are specified to apply the search term. Is that the basics of it? And will a lot of modern sites that are built dynamically fail to be crawled because you can’t really download them?

TIA.

By default Crawl downloads the specified web pages (not the complete web sites). How many pages will be downloaded in addition to the specified ones depends on the “Follow Links” settings.

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