What is this called??

I am in the process of creating a PHP based section of my website for photos/descriptions/keywords. I have the uploading and DB processes set, but now I am starting to create the point where when they will click the thumbnail and it takes them to the dynamically created page of just that photo.
I can't find any tutorials or the command line that I will need for this section of the site. Does it have a name? Each time I search google for this I get websites from people selling books on…
What is this called??

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