Holi festival is an hindu religious

Holi is an ancient Hindu religious festival but also some people known as festival of colors, spring festival, and festival of love because it's come one time in a years.

It's became popular in many parts of south Asia. You can observed in Nepal, India or others countries of south Asia. 

I saw in Hindi serial, people celebrations start on the night before Holi, where people gather, sing and dance. In India, elder brother, mom, dad, grandma or grandpa say Ramayan story to their childrens or person who is smaller than them. Next day, they plays with powder colors each other or colors with water. Some people carrying colors water with guns and fight each other for fun or for remember.