Islamism, also known as Political Islam (Arabic: إسلام سياسي‎ islām siyāsī), is an Islamic revival movement often characterized by moral conservatism, literalism, and the attempt "to implement Islamic values in all spheres of life." Islamism favors the reordering of government and society in accordance with the Shari'a. The different Islamist movements have been described as "oscillating between two poles": at one end is a strategy of Islamization of society through state power seized by revolution or invasion; at the other "reformist" pole Islamists work to Islamize society gradually "from the bottom up". The movements have "arguably altered the Middle East more than any trend since the modern states gained independence", redefining "politics and even borders" according to one journalist (Robin Wright). 

Moderate and reformist Islamists who accept and work within the democratic process include parties like the Tunisian Ennahda Movement. Jamaat-e-Islami of Pakistan is basically a socio-political and democratic Vanguard party but has also gained political influence through military coup d'état in past. The Islamist groups like Hezbollah in Lebanon and Hamas in Palestine participate in democratic and political process as well as armed attacks, seeking to abolish the state of Israel. Radical Islamist organizations like al-Qaeda and the Egyptian Islamic Jihad, and groups such as the Taliban, entirely reject democracy, often declaring as kuffar those Muslims who support it (see takfirism), as well as calling for violent/offensive jihad or urging and conducting attacks on a religious basis.
Where is it from?
Pakistan 