website - Web navigation via paths -

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I am a completely new Web novice but I could not help with paying attention to certain websites As www.stackoverflow.com) often seems to navigate to specific items through the way.
For example, clicking on "Blah-Blah-Blah" item discussed in www.whatever.com/discusions will often link URLs with a pattern www.whatever.com/discussions/123456/blah- Blah-blah I am familiar with GET / POST, and passing the parameters through www.whatever.com? Disisculation = blah-blah-blah , but this method A search through Google is not very useful. I'm assuming that the number is the database ID in the path, but after that I'm just guessing. I am thinking that a separate web page has been created for each object, but it is redundant, but then perhaps it is SEO technology.
Does anyone have the courage to expand?

You should see the whole concept that when Web2.0 grew,


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