An en dash (-) is slightly wider, showing ranges e.g. 10-20, London-Paris..
The em dash is long, and used for emphasis and breaks in thought e.g. "Dishes and dusting --- all done now." It is used in creative writing and journalism.
In Praise of Wanderlustrousness and Pop Culture
There are six Portuguese-speaking countries in Africa - Angola, Mozambique, Cape Verde, Guinea-Bissau, Sao Tome and Principe and Equatorial Guinea.
Equatorial Guinea was primarily a Spanish colony (known as Spanish Guinea) but adopted Portuguese as an official language in 2010 to join the Community of Portuguese Language Countries (CPLP) in 2014.