Every Chinese character is composed of one or a few line-drawings (radicals). These line-drawings tell you a picture-story which conveys the meaning of the Chinese character. One understands the meaning of the character if he understands the picture-story of the character.
You need to find a specific Unicode character? With Shapecatcher.com you can search through a database of characters by simply drawing your character into a box. It can find the most similar character shapes for your drawing.