There are several types of wounds including incisions, contusions, abrasions, punctures, and lacerations. Wound drainage can include serous, purulent, or sanguineous exudate. The RYB color code categorizes wounds as red, yellow, or black based on their appearance and healing phase. Red wounds are usually healing and require protection. Yellow wounds contain slough or pus and should be cleansed. Black wounds have necrotic tissue that requires debridement. Wound cleaning involves using isotonic saline to clean or irrigate wounds as needed based on the amount of exudate or foreign material present.