Most books in Europe were written in Latin. There were numerous books in the Arab World and in China that were written in other languages.
Before the Renaissance, most books were written in Latin, the language of scholarship and the Church. This was known as the lingua franca of the time, allowing scholars and intellectuals from different regions to communicate. Vernacular languages started to become more popular in literature during the Renaissance.
If you ask a question about "the following" and then don't list the items in "the following", how can you expect a sensible answer? However, the answer is most likely - Latin
C. L. Hamblin has written: 'Languages of Asia & the Pacific' -- subject(s): Languages, Polyglot, Conversation and phrase books, Polyglot glossaries, phrase books
The original Hebrew Bible that became the Old Testament was written in Hebrew and Aramaic. The Christian New Testament books of the Bible were written in Greek.
Most of the books of the Hebrew Bible were written in Hebrew (עברית), with the exception of the books of Daniel and Ezra which were written in Jewish Aramaic (ארמית), a language very closely related to Hebrew. The books of the New Testament were written entirely in Koine Greek (Ελληνιστική Κοινή).
Samuel Fiszman has written: 'Polish renaissance in its European context' -- subject(s): Bibliography, Civilization, Early printed books, Exhibitions, Lilly Library (Indiana University, Bloomington), Rare books, Renaissance 'Archiwalia mickiewiczowskie' 'Mickiewicz w Rosji'
Hebrew, Aramaic and Greek
Bennett Gilbert has written: 'The art of the woodcut in the Italian Renaissance book' -- subject(s): Accessible book, Early printed books, Printing, Exhibitions, Wood-engraving, Renaissance, History
I am not sure what you mean, but they wrote books. In the Renaissance books were published and people began to read.
Not to the Chinese! Traditional Chinese books (and therefore, Japanese) are written to be read top to bottom right to left. Books in the English and the Romance languages are read left to right and top to bottom.
Many books have been written to answer that question, but to be brief, the renaissance was the end of centuries of intellectual stagnation, and a brilliant flowering of important new ideas about many different subjects.
It is impossible to provide an exact number of books written since the first book was written, as new books are being published constantly around the world. It is estimated that millions of books have been written throughout history in various languages and genres.