Quick question, Is PSA a transparent physical table?

HI all,

I know this question has been repeated a lot. But I have always known that PSA replicates the structure on the R/3 system and it holds the data in the in

TRANSPARENT table. This is a bit confusing jargon to me.

So please correct me if I am wrong in assuming that PSA is a physical table which is transparent from the user/ or something.

Can someone tell me what " Transparent "means in this context.

Thanks,

Raj