Hezbollah is a Shi'a Islamist political and paramilitary organisation based in Lebanon. Hezbollah is now also a major provider of social services, which operate schools, hospitals, and agricultural services for thousands of Lebanese Shiites, and plays a significant force in Lebanese politics. It is regarded as a resistance movement throughout much of the Arab and Muslim world. The US government classifies Hezbullah as a terrorist organization for which it is illegal to provide material support. Many governments, including Arab ones, have condemned actions by Hezbollah while others have praised the party. Several western countries regard it in whole or in part as a terrorist organization.

Hezbollah first emerged as a militia in response to the Israeli invasion of Lebanon, also known as Operation Peace for Galilee, in 1982, set on resisting the Israeli occupation of Lebanon during the Lebanese civil war. Its leaders were inspired by Ayatollah Khomeini, and its forces were trained and organized by a contingent of Iranian Revolutionary Guards. Hezbollah's 1985 manifesto listed its three main goals as "putting an end to any colonialist entity" in Lebanon, bringing the Phalangists to justice for "the crimes they [had] perpetrated," and the establishment of an Islamic regime in Lebanon. Hezbollah leaders have also made numerous statements calling for the destruction of Israel, which they refer to as a "Zionist entity... built on lands wrested from their owners."

Hezbollah, which started with only a small militia, has grown to an organization with seats in the Lebanese government, a radio and a satellite television-station, and programs for social development. Hezbollah maintains strong support among Lebanon's Shi'a population, and gained a surge of support from Lebanon's broader population (Sunni, Christian, Druze) immediately following the 2006 Lebanon War, and is able to mobilize demonstrations of hundreds of thousands.Hezbollah alongside with some other groups began the 2006–2008 Lebanese political protests in opposition to the government of Prime Minister Fouad Siniora. A later dispute over Hezbollah preservation of its telecoms network led to clashes and Hezbollah-led opposition fighters seized control of several West Beirut neighborhoods from Future Movement militiamen loyal to Fouad Siniora. These areas were then handed over to the Lebanese Army. On the basis of the Doha Agreement, Hezbollah was granted veto power in Lebanon's parliament. In addition, a national unity government was formed in which Hezbollah has one minister and controls eleven of thirty seats.

Hezbollah receives its financial support from the governments of Iran and Syria, as well as donations from Lebanese people and foreign Shi'as. It has also gained significantly in military strength in the 2000s. Despite a June 2008 certification by the United Nations that Israel had withdrawn from all Lebanese territory, in August of that year, Lebanon's new Cabinet unanimously approved a draft policy statement which secures Hezbollah's existence as an armed organization and guarantees its right to "liberate or recover occupied lands."

On February 16, 1985, Sheik Ibrahim al-Amin issued Hezbollah's manifesto. According to this manifesto (titled "An Open Letter: The Hizballah Program"), the three objectives of the organization are:

To expel the Americans, the French and their allies definitely from Lebanon, putting an end to any colonialist entity on our land.

To submit the Phalanges to a just power and bring them all to justice for the crimes they have perpetrated against Muslims and Christians.

To permit all the sons of our people to determine their future and to choose in all the liberty the form of government they desire. We call upon all of them to pick the option of Islamic government which, alone, is capable of guaranteeing justice and liberty for all. Only an Islamic regime can stop any future tentative attempts of imperialistic infiltration onto our country.

The 1985 manifesto makes it clear that Hezbollah intends to use armed force to achieve these goals and phrases its argument for this measure through the language of defensive jihad.

Since then Hizbullah has come up with a new manifesto in Dec 1, 2009 which shifts its direction to better stay coherent with the current situation in their community(Lebanese society).This new manifetso contains language that downplays the islamic rhetoric and focuses more on integration into their community.Furthermore, the new manifesto calls for the elimination of the sectarian system in place right now in Lebanon and calls replacement of this system by a secular modern system. However , the new manifesto states that the US and Israel are still Hezbullah's prime enemies . Moreover ,it eliminates the possibility of open discussion on its right to bear arms.