Is "invisalign assist" a type of invisalign, like invisalign full, teen, etc?

I got my invisalign back in March. Unfortunately my dentist didn't properly describe the invisalign process to me. I have a total of 13 sets and on the plastic case each set comes in, "invisalign assist" is written on them. What is invisalign assist? How does it differ from other types of invisalign? Also, would I need refinements? I just got my 9th and 10th set and my dentist did not mention anything. Thank you in advance.

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