Scouts are part of a military unit, used to perform reconnaissance on enemy formations.
Scouts are primarily a small group of people who work independently, riding or running ahead of a main force. When they see an enemy formation, they report back to the main force. Stealth is important for scouts, so as not to alert a nearby enemy force of their presence.
Far Dareis Mai are often used as scouts for the Aiel. The Seanchan use raken and their riders as scouts. The Band of the Red Hand also has several scouts, sometimes people who used to follow more sordid crafts outside the Band, such as Chel Vanin, a former horse thief and poacher.