Is thumbnail a separate image, or just a smaller display field?

If I display a small image, but want to give the user the option to view a full size version of that image, is that typically two separate images with different dimensions, or am I just using one image with two different display parameters?

Not sure how this is usually done.

Thanks so much as always!

I think the only way is to just link to a different screen with a seperate current image.

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