You did not answer my question.
For example, the language of Iran,
why is their alphabets looks so different from Latin alphabets? Is
ancient Egyptian language graphical or alphabetical?
And, if the language of whole world use some kind of alphabet,
why is Chinese language different?
I asked you to clarify your question and you failed to do so. Stop trying to blame your inadequate language skills on others.
In response to your 3 questions:
1. Which language of Iran? Persian is the official language written in Persian alphabet, but Kurdish, for instance, is written using Persian, Latin, Armenian or Cyrillic depending where the speaker is. Why do they use Persian? A consequence of Arabic invasion. It's based on the Arabic alphabet, with in turn can be traced back to Phoenician via Nabatean, Syriac and Aramaic. Latin can also be traced to Phoenician via Greek. Why do they differ? Different phonemes requiring variations on previous symbols, so local variants were used. Humans are an imaginative bunch so they created variant symbols to represent their phonemes as required.
2. Ancient Egyptian was written using Hieroglyphs which included logograms, syllabary and alphabet. Later scripts dropped the logograms.
3. Not every language has a written form. But to address the Chinese question: There are potentially myriad reasons why Chinese uses logograms. Consider:
a) Chinese suits a logographic system as the same character/word is pronounced differently in different locations. So a character can convey the same meaning even if pronounced differently. Thus it is possible to communicate in writing where speech fails.
b) Once you start down a path of logograms it would take a reform to change to use an alphabet instead. Although this has been suggested several times in China, it has never happened.
c) Calligraphy is highly regarded in China. An alphabet does not lend itself so well to such artistic expression.
Ultimately your question boils down to "why don't we all use the same writing system?" Different languages use different phonemes and have different requirements for representation. Humans are, as mentioned above, also imaginative so they will find different solutions to common problems.
