This is the 3561st most frequent Arabic word.
يحتوي
"يحتوي" means "to contain" or "to include."
Here, 'يحتوي' is used to indicate that the book includes or possesses certain content, namely useful information.
الكتاب يحتوي على معلومات مفيدة.
The book contains useful information.
In this instance, 'يحتوي' is being used to explain that the box holds something within it, which are the old toys.
هذا الصندوق يحتوي الألعاب القديمة.
This box contains the old toys.
Here, 'يحتوي' demonstrates that the computer program has or includes within it the new tools for writing.