Academy Students are ninjas in training that are hoping to become a real ninja in the future. In the academy they are taught to throw Shurikans and kunai and try and hit directly on their target along with teaching the students how to use jutsus that are common amongst regular Genin and Chuunin ranked ninja. Inorder to Graduate they have to perform a jutsu perfectly that is choosen by the academy test examiners. Once they have fully completed the Ninja training and graduated they will be given their own leaf ninja head band to prove that they have graduated.they will also be aloud to leave the villages on foreign missions and take on Enemies from other villages or other unknown areas throughout the land of fire.
Genin is the lowest Rank for Ninja Ranks in all of the Shinobi Villages. When you are a genin you get your village's headband. The missions you usually do as a Genin are non life threatening and quite boring. For Example: Catching Cats, helping someone with Gardening and so on. In order for any Genin to Go up a Ninja Rank they need to Compete in a Chuunin Exam. Some Genin ,as long as they're with a Chuunin or Jounin Rank Ninja, will take on Harder missions. In order to become a Genin Ranked Ninja, you Must Graduate from the Ninja Academy of the Village you Decended from or living in.
Chuunin are the second lowest ninja rank for all ninjas in every Ninja Village. You usually become a Chuunin Ranked Ninja when you Pass the Chuunin Exam that happens every 3 years when the Genin Ranked Ninja Gather together to compete from a few countries. Sometimes Chuunin ranked ninja are known as the "middle Class ninja". Chuunin ranked ninja Go through Harder C ranked mission and even some B ranked Missions if the kage village leader wants them to take the challenge. Chuunin rank ninja sometimes become Academy teachers. Both the Jounin and the Chuunin ninja rank wear similar Clothing as Seen in the Iruka Umino Picture Beside this description.
The Jounin ninja are Top Rank Ninjas next too the kage village leaders that Get B Ranked Missions which could lead too there Death along with A ranked missions. Some Experienced Jounins ranked ninja are Even sent on S-ranked Missions which some kage village leaders would take on. Jounin ranked ninja are Heavily Relied on by the kage of the Village. it is not known yet how to become a Ninja ranked Jounin other then the fact that you need to have Great leadership skills and be able to plan things in advance. Jounin Ninja Wear the same clothes as chuunin.
Anbu Ranked Ninja are special Elite Ninja Assigned by the Kage. Anbu ranked ninja usually do Dangerous missions normal ranked Ninjas wouldn't dream of doing like Assassination attempts and hunting Missing-nin and S-ranked Criminals that are in the Bingo Book. the Anbu ninja rank are the Kage's most trusted group of ninjas.
Kage Ninja leaders are the Strongest Ninjas in the Hidden Villages. Throughout the land of fire there Exists 5 top Ranked Ninja leaders and they are Hokage, Raikage, Kazekage, Tsuchikage, and lastly Mizukage. Kage usually Face off Against The hardest Missions, and Help setup and choose Alliances with other Villages. When in War the Kage usually plans the actions the Village should take and there plans to fight back. A Good Kage must be prepared for anything including Assassination attempts.
S-rank Ninja are the most Deadliest Ninja of all. They are cabable of Great Evil Deeds and usually are in the Bingo Book. S-ranked Criminals can Rank from abilities majorly. Some S-ranked Ninja are even strong enough to take down hokage's. An Example of this would be Orochimaru defeating the 3rd Hokage.Most the major S-Ranked criminals belong to the Akatsuki that we've seen in the Naruto series so far though. But not all Akatsuki are S-ranked.