Sixty-two tourists were killed at Egypt's Deir el-Bahri archaeological site in Luxor. Six assailants, thought to have been linked to al-Qaida, disguised themselves as members of the security forces and descended on the temple armed with automatic machine guns and knives. Egyptian tourist police and military forces eventually stopped the attackers, who were either killed or committed suicide.

A series of bomb attacks targeting tourists in Egypt's Sinai Peninsula killed 34 people and injured 171. Most of the casualties were killed after a truck drove into the lobby of the Taba Hilton. Two more bombs went off at campsites some 50 kilometers away, killing a handful of people. Roughly half the casualties were foreigners, including 12 Israelis.

The attack in the Egyptian resort city of Sharm el-Sheikh was carried out on Egypt's Revolution Day and for a decade remained the worst Islamist attack in Egypt's history. A series of bombs planted close to bars and restaurants, as well as by a hotel, killed 88 people and injured 150. The majority of victims were locals, although a number of tourists also died, including 11 British nationals.

The attack on the the Egyptian resort city of Dahab marked the third consecutive year that tourist resorts had been targeted. A series of blasts in a restaurant, a café and a market killed at least 23 people, most of whom were local, and wounded around 80. Egyptian officials maintain that the attacks were carried out by the Islamist cell known as Jama'at al-Tawhid wal-Jihad, a forerunner of "IS."

All 224 mostly Russian passengers were killed when Metrojet Flight 9268 suddenly dropped out of the sky over the Egypt's Sinai peninsula, shortly after having taken off from Sharm el-Sheikh international airport. Authorities agree that it appeared a bomb had been snuck on board. The so-called "Islamic State" jihadi group claimed responsibility for the attack.

While Egypt's Coptic Christians have for decades been targeted by Islamists, deadly attacks on Coptic churches have increased dramatically in recent months. At least 102 Egyptian Christians have been killed in four separate attacks since December 2016.

On April 9, 2017, the Coptic church faith followers encountered devastating twin blasts in Tanta and Alexandria as they celebrated Palm Sunday, killing 28 and 17 people respectively. On November 24, 2017, a bomb went off outside of Al-Rawda mosque in the city of Al-Arish in the northern Sinai Peninsula, which claimed the lives of more than 300 people and injured 109 others.

The "Islamic State" (IS) — also known as ISIL, ISIS and Daesh — is an al-Qaida splinter group with a militant Sunni Islamist ideology. It emerged in the aftermath of the US-led invasion of Iraq in 2003 and is led by Abu Bakr al-Baghdadi. Their goal is to create a worldwide "caliphate." It gained worldwide notoriety in 2014 after a blitzkrieg military campaign that resulted in the capture of Mosul.

IS is believed to be operational in more than a dozen countries across the world. It controls territories in Iraq and Syria. However, the group has lost much of the territory it controlled in Iraq and Syria at the height of its expansion in 2014.

The US leads an international coalition of more than 50 countries, including several Arab nations. Russia, Iran and its Lebanese Shiite ally Hezbollah, which all support the Syrian government, also fight IS. Regional forces such as the Kurdish peshmerga (above) and US-backed Syrian Kurdish fighters, fight IS on the ground. The Iraqi army and militia have pushed IS from large parts of the country.

One of IS' main sources of income has been oil and gas. At one point, it controlled an estimated one-third of Syria's oil production. However, US-led airstrikes deliberately targeted oil resources and the Syrian government as well as US-backed Syrian Kurdish fighters have retaken most oil wells. Other means of income include taxes, ransom, selling looted antiquities and extortion.

IS has claimed responsibility for numerous terrorist attacks across the globe. The militant group has targeted capitals across the EU, including Berlin, Brussels and Paris. IS leaders have encouraged so-called "lone wolf" attacks, whereby individuals who support IS carry out terrorist acts without the direct involvement of the group.

The group uses various tactics to expand its power. IS fighters have looted and destroyed historical artifacts in Syria and Iraq in an attempt at "cultural cleansing." The group has also enslaved thousands of women from religious minority groups, including Yazidis. IS also uses a sophisticated social network to distribute propaganda and recruit sympathizers.

IS has further exacerbated the ongoing Syrian conflict. Millions of Syrians and Iraqis have fled their homes, many traveling to Europe in pursuit of refuge. Although it has lost all of its strongholds, the militant group has left extraordinary destruction in its wake. Areas affected by the militant group's rule will likely take years to rebuild.