المسجد

In a sentence

• ذهبت إلى المسجد للصلاة.

  I went to the mosque to pray.

  Here, 'المسجد' specifies the building where Muslims perform prayers.

• يقع المسجد بجانب المدرسة.

  The mosque is located beside the school.

  In this sentence, 'المسجد' denotes a physical landmark relative to another.

• يزور السياح المسجد الكبير في المدينة.

  Tourists visit the main mosque in the city.

  Here, 'المسجد' is used to refer to a specific, historically or architecturally significant mosque.