Yes, that's correct, if you describe it basically a high capacity flash drive. Or, if you prefer, a portable hard drive with no moving parts.
I don't know much about solid state drives, except that to my limited technical understanding they're essentially hard drives with no moving parts.
Recently I was in the B&H Photo store in NYC, and for the first time I saw portable SSDs. I didn't know such a thing even existed. I have a portable hard drive, and I noticed that the portable SSDs they had on display were significantly smaller.
Am I correct in my guess that portable SSDs are basically high capacity flash drives? Or, is there a significant difference between SSDs and whatever technology is used to create flash drives? (I suppose I could have asked someone at B&H, but I don't trust salesmen, even at a place with as good a reputation as they have.)

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