Most Islamic scholars agree that the hijab, which covers the head and neck, and comes in any number of shapes and colors, must be worn by Muslim women. American teen Hannah Schraim is seen wearing one here while playing with her brother.

The chador, which is usually black, is a body-length outer garmet often worn in Iran and among modern-minded women in the Gulf States, as here in Saudi Arabia. It is not fastened with clasps or buttons and therefore has to be held closed by the wearer.

A niqab is a veil and scarf that covers the entire face yet leaves the eyes free. It covers a woman's hair, as it falls to the middle of her back and some are also half-length in the front so as to cover her chest. Here it is being worn by women attending a rally by Salafi radicals in Germany.

An abaya is a loose-fitting, full-length garment designed to cover the body. It may come in many different styles, as seen here at an Arab fashion show, and is often worn in combination with hijab or niqab.

The burqa is the most extensive of all Muslim garments, covering the entire body from head to toe. It traditionally has a woven mesh area around the eyes, severely restricting the wearer's vision. Here they are seen casting their ballots in Pakistani parliamentary elections.

Queen Rania of Jordan says that Islam does not coerce women to wear any head coverings and that it is more important to judge a woman by her ethics and values, rather than what she wears. She is seen here meeting refugees in Greece.

Three quarters of German-born Muslims grow up with German as a first language. Among immigrants, only one fifth claim that German is their first language. The trend of language skills improving with successive generations is apparent across Europe. In Germany 46 percent of all Muslims say that their national language is their first language. In Austria this is 37 percent, Switzerland 34 percent.

According to a 2017 study by Religion Monitor, 87 percent of Swiss Muslims have frequent contact with non-Muslims in their free time. In Germany and France it is 78 percent, while in the UK it's 68 percent and Austria, 62 percent. A large majority of Muslims in succeeding generations are found to have constant contact with non-Muslims, despite existing societal hurdles.

Ninety-six percent of French Muslims feel connected with their country. The percentage of Muslims feeling the same way is equally high in Germany, while Switzerland has the highest levels, at 98 percent. Yet despite its relatively longer history of institutional openness to religious and cultural diversity, fewer Muslims, (89 percent) report feeling close ties to the UK.

Muslims from immigrant families maintain a strong religious commitment which continues across generations. Sixty-four percent of Muslims living in the UK describe themselves as highly religious. The share of devout Muslims stands at 42 percent in Austria, 39 percent in Germany, 33 percent in France and 26 percent in Switzerland.

According to data, 36 percent of German-born Muslims finish their education by the age of 17, without pursuing further studies. In Austria too, this proportion is around 39 percent. On the other hand, owing to a more equitable school system in France, Muslims there register significantly better educational outcomes. Only one in ten Muslim students leaves school before reaching 17.

About 60 percent of all Muslims who moved to Germany before 2010 now hold a full-time job, while 20 percent work part-time jobs. The figures are similar to those of non-Muslims. Muslims in Germany had higher employment rates than in other European countries. In France, the unemployment rate among Muslims is 14 percent, far higher than the 8 percent reported for non-Muslims.

More than one in four non-Muslims in Austria do not want Muslims neighbors. This percentage is remarkably high in the UK as well, at 21 percent. In Germany, 19 percent of non-Muslim respondents say that they would not welcome Muslim neighbors. The figure stands at 17 percent in Switzerland and 14 percent in France. Overall, Muslims are among the most rejected social group.

The information included in this picture gallery is from the Bertelsmann Foundation’s study titled ‘Muslims in Europe - Integrated but not accepted?’ Conclusions are based on a representative survey of more than 10,000 people in Germany, Austria, Switzerland, France and the UK. Muslim refugees who arrived in Europe after 2010 were not surveyed for the study.