For your file to be properly created (and this will be one of the mandatory criteria for the file to comply with the PDF/X standard), your trimbox must be contained in your bleedbox, which must itself be contained in the mediabox. The trimbox corresponds to your finished format and the bleedbox corresponds to the area that contains the objects that will be printed in excess of the finished format (and therefore being deleted during processing) – this area is very important, it allows a perfect printing finishing. The mediabox is the largest box and (normally) contains all the objects of your document.
They may or may not be present in your PDF file, depending on the software and method you used to create your PDF.
These different boxes are used to precisely define the content of your PDF file.
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