D-Rank is one of the six classificiation. It is preceded by E-Rank and 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 Ninja 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.