The author of the book is
Abdullah bin Yusuf bin Ahmed bin Abdullah bin Yusuf, Abu Muhammad, Jamal al-Din, Ibn Hisham, who in the art of grammar as the Caliph of Sibawayh.
The book contains a comprehensive summary of the rules of grammar, and a simplified explanation of the rich text. The book is one of the most important, famous, and easiest books in the art of grammar.
Its author says in the introduction to the book:
“...And after these are the jokes that I wrote on my introduction called Drops of Dew and the Echo, raising her veil, revealing her veil, complementing its evidence, complementing its benefits, sufficient for those who limit themselves to it, and sufficient for the purpose of seeking it from among the students of Arabic knowledge, and it is God who is responsible for making it beneficial to you.” What is of benefit to its origin and to show us the paths of good deeds... "