Holi is the most "thrilling" festival of India. It is also known as the "Festival of Colours" or the "Festival of Love" (between Radha and Krishna).
This festival signifies the victory of Good over Evil, the arrival of spring, end of winter, and for many, a festive day to play with colours, forgive & forget and repair broken relationships. It is also celebrated as a thanksgiving for a good harvest.
This festival of colours has a great SOCIAL significance. It helps to bring the society together and strengthen the secular system of the society. The fact that it is celebrated by people of all religions is a proof that it is a social festival in the "true" sense.
Besides, on this day people do not differentiate between the rich and poor, Hindu and Muslim etc. Everybody celebrates the festival together with a spirit of warmth and brotherhood.