الجزائر

In a sentence

• زرت الجزائر في الصيف الماضي.

  I visited Algeria last summer.

  Here, "الجزائر" refers to the country of Algeria as a proper noun signifying a geographic location.

• تُعتبر الجزائر من الدول العربية الكبيرة.

  Algeria is considered one of the big Arab countries.

  In this sentence, "الجزائر" functions as the subject noun, again referring to the country.

• قرأت كتابًا عن تاريخ الجزائر.

  I read a book about the history of Algeria.

  Here, "الجزائر" is used in a possessive phrase to indicate the history belonging to that country.