"Dīn" is a word that means religion or way of life in Arabic. It's an important concept for people who follow Islam, which is a religion that many people in the Middle East and beyond practice. For Muslims, dīn involves following God's rules and instructions, which are outlined in the Quran, the holy book of Islam. This includes things like praying five times a day, giving to charity, being kind to others, and following certain dietary restrictions (like not eating pork). Dīn is an important part of Muslim identity, and something that many people take very seriously.