Mint - mint with gum (or w/o gum if issued as such) and with tracks or present hinges. Unused - mint no gum or re-gummed. Used - cancelled (postal or CTO). Stamps scanned in mounts - sometimes there are color discoloration causing by scanner light.
There is also horizontal or vertical lines on the pictures causing by mount edges and are not stamps defects. This also applies to second chance offers.