Official language to the government in their native languages. In countries that do not formally designate an official language, a "de facto" national language usually evolves. English is the most common official language, with recognized status in 51 countries. Arabic, French, and Spanish are also widely recognized. An official language that is also an indigenous language is called "endoglossic", one that is not indigenous is "exoglossic". An instance is Nigeria which has three endoglossic official languages. By this the country aims to protect the indigenous languages although at the same time recognising the English language as its lingua franca. Around 500 BC,
President of Egypt returning to office after mass demonstrations by the Egyptian public. President Mubarak also resigned on 11 February 2011 after eighteen days of protest against his regime. The president may resign by delivering his resignation to the People's Assembly under the 2012 and 2014 Constitutions. The Presidency in Egypt controls 8 presidential residences in addition to other presidential guest houses. Egypt's official residence and office of the president is Heliopolis Palace in Cairo. Other presidential palaces include: There are two living former Egyptian Presidents: President of Egypt The President of the Arab Republic of Egypt () is the head of state