"Yes" means you want to review and approve the proofs before we make prints, and is the default option. If you're the artist, we generally recommend looking at the proofs before we print. Proofs must be reviewed before we proceed to printing, or the color is considered "as is".
"No" means that we will proof and approve the colors in-house. If you're a third party, collector, relative of the artists etc, its often less essential to have you examine the color before a final print, since our team of color pros will do their best to match it.