Cambodia has established Buddhism as its state religion, with the Khmer people being the largest group, most of whom believe in Theravada Buddhism. Theravada Buddhism was introduced into Cambodia from Sri Lanka in the 11th century and shook the belief status of the original popular Brahmanism.  Buddhism gradually became the new major belief in Cambodia after replacing Shiva and Mahayana in the 14th century. In addition, the local Jing and Hua people mostly believe in Mahayana, Catholicism and Protestantism, while the Zhan people mainly believe in Islam, with a small number of people worshiping the primitive creatures.

Most Cambodians use Khmer language. The Khmer language has its own Khmer numerals, which are more circulating than Arabic numerals in Cambodia. The Zhan people mainly use the Zhan language, while the Vietnamese mainly use Vietnamese, and other ethnic groups have their own languages. French, once the second largest language after the Khmer, is no longer common. Only a few people are still familiar with French and regard it as their mother tongue. In recent years, due to economic progress, Mandarin and English are very popular in Cambodia.

In Cambodia, there are many festivals in the year, including the New Year's Festival, the Bon Om Touk Festival, the Kite Festival, the Vegetarian Food Delivering  Festival, the Rainy Season Housing Festival, etc. Among them, the Bon Om Touk Festival is the largest and grand traditional festival in Cambodia, designed to celebrate the end of the rainy season and the retreat of the river.

Independence Day: November 9 (In November 9, 1953, the Kingdom of Cambodia declared its independence from French colonial rule, which was designated as Cambodia's National Day and Cambodia's Army Building Day)

King's Birthday: May 14 (National Celebration for 3 Days)

Buddhist New Year: April 13-15

Royal Ploughing Festival: The fourth day of the last quarter of June in the Buddhist calendar (the king or his representative holds a symbolic farming ceremony in Sanam Luang, which is adjacent to the royal palace, to pray for good weather and abundant grain in the coming year).

Bon Om Touk Festival (also known as Dragon Boat Festival and Cambodian National Traditional Festival): November 13-15 (when the rainy season ends and the dry season enters, the Cambodian people hold dragon boat races on the Tonle Sap River in front of the palace to express their gratitude for the kindness of the nurturing of Tonle Sap River and Mekong River.)

Sihanouk's Birthday: October 31 (National Celebration for One Day)

Cambodia, with 460 kilometers of coastline, became a member of the world's most beautiful beach club in 2011 and won the World's Best Tourist Destination Award in 2016.

Cambodia became a member of the UNESCO World Heritage Committee on November 28, 1991. Cambodia has a total of 3 world heritages, all of which are cultural heritages. Angkor Wat (1992, World Heritage), Temple of Preah Vihear (2008, World Heritage) and Temple Zone of Sambor Prei Kuk, Archaeological Site of Ancient Ishanapura (2017, World Heritage).