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.

Marwa El-Sherbini, a pharmacist who lived with her husband and son in Dresden, was killed in Dresden's district court on July 1, 2009. She was stabbed by a 28-year-old Russian-German man shortly after testifying against him in a verbal abuse case. He'd previously called her a "terrorist" and "Islamist." El-Sherbini is considered to be the first murder victim of an Islamophobic attack in Germany.

Right-wing extremist Anders Behring Breivik killed 77 people in two lone-wolf terror attacks on July 22, 2011. He first set off a bomb in the government district in Oslo before killing young people attending a summer camp on the island of Utoya. Prior to the attack, Breivik published a manifesto where he decried multiculturalism and the "Islamization of Europe."

Three university students — Deah Barakat, his wife Yusor Abu-Salha, and her sister Razan Abu-Salha — were shot dead by their 46-year-old neighbor on February 10, 2015. The shooter described himself as an opponent of organized religion and reportedly repeatedly threatened and harassed the victims. The killings sparked outrage online, with millions of tweets using the hashtag #MuslimLivesMatter.

On June 17, 2015, a white supremacist opened fire at the Emanuel African Methodist Episcopal Church in Charleston, South Carolina. Nine African-American worshipers were killed, including a pastor at the church, which is one of the oldest black congregations in the United States. The 21-year-old suspect was convicted of a federal hate crime and sentenced to death.

A mass shooting at a shopping mall in Munich on July 22, 2016 wounded some 36 people and killed 10 — including the 18-year-old shooter. The perpetrator, a German of Iranian descent, made xenophobic and racist comments and idolized school shooters, according to police. He also suffered from depression, was frequently bullied and wanted to take revenge on people with immigrant backgrounds.

On June 19, 2017, a 47-year-old man killed one person and wounded another 10 after driving a van into a group of pedestrians near the Finsbury Park mosque in north London. All of the victims were Muslims who were on their way to take part in special night prayers during Ramadan. The perpetrator later stated that he was motivated by a "hatred of Islam" and was sentenced to life in prison.

One woman was killed and dozens were wounded when a white nationalist drove his car into a crowd of counterprotesters in Charlottesville, Virginia on August 12, 2017. The counterprotesters had been demonstrating against the Unite the Right rally, a gathering of white supremacists, white nationalists and neo-Nazis. The suspect was sentenced to life in prison.

A gunman opened fire on worshipers at the Islamic Cultural Center in Quebec City in late January 2017, killing six people and wounding over a dozen. The shooting took place during evening prayers. Canadian Prime Minister Justin Trudeau condemned the shooting as "a terrorist attack on Muslims in a center of worship and refuge."

On October 27, 2018, a 46-year-old gunman opened fire at a synagogue in the US city of Pittsburgh, killing 11 people and wounding seven. He reportedly shouted anti-Semitic slurs during the attack and previously posted conspiracy theories online. It was the deadliest attack on Jewish people in US history.

Shortly after midnight as people were out celebrating, a 50-year-old man carried out targeted attacks on immigrants in the western German cities of Bottrop and Essen — injuring eight people, one seriously. He deliberately drove his car at two Syrian and Afghan families who were out celebrating with their children in Bottrop. German authorities said "he had a clear intent to kill foreigners."

At least 50 people were killed and dozens others were injured in twin terror attacks at mosques in Christchurch. Officials called it a "right-wing extremist attack" and the deadliest shooting in New Zealand's history. One of the gunmen livestreamed the attack and posted a racist manifesto online before the attack. Prime Minister Jacinda Ardern called it "one of New Zealand's darkest days."