Originally Posted by http://en.wikipedia.org/wiki/Chinese_language#Written_Chinese
Chinese characters evolved over time from earlier forms of hieroglyphs. The idea that all Chinese characters are either pictographs or ideographs is an erroneous one: most characters contain phonetic parts, and are composites of phonetic components and semantic radicals. Only the simplest characters, such as ren 人 (human), ri 日 (sun), shan 山 (mountain), shui 水 (water), may be wholly pictorial in origin. In 100 CE, the famed scholar Xǚ Shèn in the Hàn Dynasty classified characters into six categories, namely pictographs, simple ideographs, compound ideographs, phonetic loans, phonetic compounds and derivative characters. Of these, only 4% were categorized as pictographs, and 80–90% as phonetic complexes consisting of a semantic element that indicates meaning, and a phonetic element that indicates the pronunciation. Generally, the phonetic element is more accurate and more important than the semantic one.[citation needed] There are about 214 radicals recognized in the Kangxi Dictionary.