Read the text carefully to answer the following questions.

    Angelina Jolie was born in Los Angeles on June 4th, 1975. She is an American actress, filmmaker, and humanitarian. She has awarded numerous accolades, including an Academy Award and three Golden Globe Awards. And she has been named Hollywood's highest-paid actress multiple times.

    Angelina has above average height, 170 cm tall. Her weight is about 55 kg, and it's proof that she is very thin. She has a square face with a long and narrow nose. She's got largemouth and small, almond-shaped, green eyes. Her hair is long, nut-brown, and straight.

    Angelina hasn't limited her career to acting. She became involved in humanitarian work while filming in Cambodia. She is now a UN Goodwill Ambassador, visiting refugee camps in poor countries. She donates large sums of money to help the plight of underprivileged people. She has effectively used her stardom to highlight world problems.

What does Angelina do as a UN Goodwill Ambassador?