It’s Banned Books Week, a yearly reminder that censorship exists and not all books are beloved by everyone.

When you think about banned books, you may think of the past. Novels written many years ago come to mind, like "The Catcher in the Rye," "Adventures of Huckleberry Finn" and "Tropic of Cancer." But book banning and censorship is still very much alive and well.

To call attention to this issue, the American Library Association produces a yearly top 10 list of most challenged books. The ALA's list is based on information gleaned from media stories and from voluntary challenge reports — documented requests to remove materials from schools or libraries — for the previous year that are sent to the ALA Office for Intellectual Freedom. This year, the ALA expanded the list from 10 to 11.

More:Public libraries across the country face a different type of censorship | Opinion

11 most-challenged books of 2018

According to the ALA, the organization tracked 347 challenges to library, school and university materials and services in 2018. Of the 483 books challenged or banned in 2018, the ALA found the top 11 most-challenged along with the reasoning, to be:

1. “George” by Alex Gino

Reasons challenged: For encouraging children “to clear browser history and change their bodies using hormones, and for mentioning ‘dirty magazines,’ describing male anatomy, ‘creating confusion,’ and including a transgender character.”

2. “A Day in the Life of Marlon Bundo” by Jill Twiss; art by EG Keller

Reasons challenged: For “including LGBTQIA+ content, and for political and religious viewpoints.”

3. Captain Underpants series written and illustrated by Dav Pilkey

Reasons challenged: For “encouraging disruptive behavior.” One book in the series, “Captain Underpants and the Sensational Saga of Sir Stinks-A-Lot” was specifically challenged for including a same-sex couple.

4. “The Hate U Give” by Angie Thomas

Reasons challenged: For being “deemed ‘anti-cop” and for “profanity, drug use and sexual references.”

5. Drama written and illustrated by Raina Telgemeier

Reasons challenged: For “including LGBTQIA+ characters and themes.”

6. “Thirteen Reasons Why” by Jay Asher

Reasons challenged: For “addressing teen suicide.”

7. “This One Summer” by Mariko Tamaki; art by Jillian Tamaki

Reasons challenged: For “profanity, sexual references, and certain illustrations.”

8. Skippyjon Jones series written and illustrated by Judy Schachner

Reasons challenged: For “depicting stereotypes of Mexican culture.”

9. “The Absolutely True Diary of a Part-Time Indian” by Sherman Alexie

Reasons challenged: For “sexual references, profanity, violence, gambling, and underage drinking, and for its religious viewpoint.”

10. “This Day in June” by Gayle E. Pitman; art by Kristyna Litten

Reasons challenged: For “including LGBTQIA+ content.”

11. “Two Boys Kissing” by David Levithan

Reasons challenged: For "including LGBTQIA+ content.”