ة = Taa marbooota = this is mostly used to form feminine form like
طالب - طالبة
كاتب - كاتبة
etc, it sounds like /t/ sound when is being added to another word of the context of definition like the the board of advertisements = لوحة الاعلانات
e.i when you need to use /of/ in English as you define something by relating it to something else.
more two examples
نشرة الاخبار
news casting = actually we say in Arabic = the casting of news
وزيرة التعليم
the minister of education
:)