D-rank is one of the five classifications. It is followed by C-rank. It is typically used when classifying techniques intended for ninja of the genin level. D-rank techniques are often one of the first techniques a ninja will learn after leaving the Academy.
There are also D-rank missions, the lowest classification a mission can receive. These missions are usually assigned to genin. Naruto Uzumaki describes D-rank missions as not being actual missions as they deal with tasks as simple as finding missing pets and weeding a garden. D-rank missions pay between 5,000 and 50,000 Ryo.