Query Regarding Action Attribute in form element

Hello All, We have written the form tag with action attribute in “Create A Form Element” HTML challenge as :-

<form action="/submit-cat-photo">
  <input type="text" placeholder="cat photo URL">
  <button type="submit">Submit</button>

Could you please confirm if the location specified as the value of action attribute above i.e. “submit-cat-photo” is a php file ? Also what is the location of that file ?

Many Thanks !

Sorry the tag element didnt come up completely in my above query. I’m not in fact able to post the element completely.