The ACLU, or American Civil Liberties Union, is a nonprofit organization dedicated to defending and preserving individual rights and freedoms guaranteed by the U.S. Constitution. Founded in 1920, the ACLU works on a wide range of issues, including free speech, religious freedom, and equal protection under the law. They often take legal action to challenge laws and practices that they believe violate civil liberties. The ACLU also engages in public education and advocacy to raise awareness about civil rights issues. They provide resources and support to individuals facing discrimination or injustice, ensuring that everyone has access to their rights. Through their efforts, the ACLU aims to create a more just and equitable society for all.