Does "merge in Photoshop" always mean HDR?

I have CS4 and am familiar with HDR techniques either with Photoshop or Photomatix.  But occasionally I hear of images being "merged" in Photoshop and don't know if this means HDR, or using different exposures and/or layers to create an image in another way.  Can anyone educate me on this please?

Hi,
Only when calling out HDR specifically, as in 'Merge to HDR Pro...'. "Merge" as in Photomerge is used to stitch together multiple images for panoramas, collages, architectural photos, etc. where one single frame is not able to capture the intended image.
You might also hear 'merge' used in reference to merging multiple layers into a single layer, or 'merging down' referring to merging an active working layer down into a composition layer.
regards,
steve

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