These shots of the individuals, the setting, and the activity are candid or spontaneous rather than a sequence of posed ones (i.e., unstyled). Typical scenes can include the opulent raw bar before guests start eating, your ragtag group of relatives dancing, and you and your bridesmaids laughing with champagne in hand.
The photographs capture the moments exactly as they occurred and together they form a story. With a strictly photojournalistic photographer, you will never see people staring at the camera. More styled candid photos are another moderate choice. For instance, before starting to shoot, your photographer might take a coat off a chair or smooth out the bedspread in the space. (The shots are still candid but not purely photojournalistic.)