This is the 1265th most frequent Arabic word.
الكتاب
The book.
In this sentence, 'الكتاب' refers to a specific book being talked about or referred to in the context of past reading.
أحب الكتاب الذي قرأته أمس.
I love the book I read yesterday.
Here, 'الكتاب' is used in a general sense to represent books as sources of knowledge, emphasizing their importance without referring to a specific instance.
الكتاب مصدر مهم للمعرفة في حياتنا اليومية.
Books are an important source of knowledge in our daily lives.
In this case, 'الكتاب' denotes a particular book that was recently acquired, with the modifier 'الجديد' specifying its novelty.