"Hmm, that was alright. But let me add a little more
Ninjutsu, or Ninja Arts, is the ability to, through the use of chakra, accomplish tasks that would be otherwise impossible to do. Ninjutsu are done by 2 stepts: focusing your chakra and molding your chakra. Focusing is using your will power to "will" a portion of your chakra to do something. On the other hand, molding is giving your chakra a set of characteristics that will enable you to produce the desired end effect.
Think of the chakra flow as our breathing. Normally, it happens passively, without any conscious intervention. However, when you need to you can use your will to control it. Its the same with your chakra flow. Its happens normally without your conscious intervention. However, you can focus your chakra and make it produce something.
Now, moulding the chakra is done by two basic principles: Shape Manipulation and Nature Transformation. These correspond to the two broad areas that one needs to change in the chakra to produce a jutsu. Shape manipulation pertains to the ability to give your chakra a desired form while Nature transformation pertains to the ability to give your chakra a desired set of characteristics/properties. Sometimes, to better mold chakra, ninja use Handseals. Handseals are simply hand gestures that allow the ninja to more easily concentrate and mold the chakra into the desired technique.
Any questions?"