All chinese characters contain a particular component called "radical" or "side". this is the basic part of chinese character,These elements were once characters themselves, but some are no longer recognizable as such. Learning the radicals helps to categorize and memorize characters; if you know each radical,it’s easy for you write chinese character in the future. the presence of a certain radical can even suggest the meaning of the whole character, which often relates to the original form of the radical. On the other hand, the non-radical component of the character often suggests its pronounciation, or viceversa.