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Ninja:
A Ninja is a person who's been tought to mold and release chakra. By changing chakra he can use various sorts of attacks on opponents. If he uses genjutsu (meaning he disrupts the chakra in an opponents brain), he can make them picture things they don't see. Ninja's also have different elements that they use for combat, and the elements are: Fire, Water, Lightning, Earth and wind. Some elements (like fire), is more normal than other (like wind.) A female ninja is called Konouchi and a male ninja is called a shinobi. Ninja's train under persons they call senseis and the sensei's jobs are to make sure the ninja's learn everything about the use of chakra.
Chakra:
Chakra is an "energy" that lives in all humans, not just ninjas but normal humans aswell. There are 361 chakra points in the body of a human, and if just one of them gets hit and broken then the whole chakra stream flow will stop. By changing your chakra you can get elemental chakra and genjutsu. If you use chakra in your feets you're able to walk on water or run up walls and trees. If you use to much chakra (for example use a jutsu to many times in one day), you'll run all out of energy and stamina. Without any chakra there's no way a human can move. If you use TO much chakra you might even risking ending up dead. Chakra can be used to treat others, and that's called Medical chakra. Chakra is normaly blue when it's released from your body, but the med chakra is green.
Lightning:
Lightning is one of the five basic elements. It's greatest power is it's sharpness and large destruction force. Lightning jutsus are also very fast due to the real lightning is so fast. Also, it paralyze everything that hits is, so it's a great all round element. If you cover your body with lightning you'll gain a huge boost in speed and strenght.
Some lightning jutsus: Chidori, Kirin, Raikiri
Some lightning users: Kakashi, Kirabi, Sasuke