yeah, welcome. you know me, trying to keep the description to 30 words or less ...
search engines and directories. once upon a time they were quite different. Not now. Google is a search engine, but it now offers a directory. Directories also now provide searches.
A directory is kinda like a very simple well, Dewey Decimal Classification system (hey, I'm a cataloger). they divide the information into categories, subcategories, etc. So you only have to point and click, point and click, to get to something you're interested in finding.
y'all guys know all that!