What is the difference between a Chinese letters and Japanese letters?

The Japanese language is made up primarily of 3 components, namely:

• Kanji, 漢字
• Hiragana 平仮名
• Katakana　片仮名

The Kanji component is based on the Chinese Han Zi 汉字 but in the traditional format, or complex form, as opposed to the modern simplified format. Currently Beijing advocates simplified format while Taiwan advocates complex format. The complex format appears to be used less commonly used nowadays in the world.

However, over time, some Chinese characters have changed or have fallen into disuse, whereas Japan may have continued to use those very characters no longer in use by the Chinese, resulting in the modern day version of Kanji, which contains many characters that are now different from their original Chinese precedents, and thus becoming a unique component of Japanese Language, found no where else.