Best wishes of holi Purnima ..(Purnima means the day on which you see a full moon in the sky) and holika dahan..!
Today is the last festival of the year on which we burn all our bad things in us..this is why holi and holika dahan is important festival...
Those who wanted to know much about todays festival may browse following link...
http://www.thecolorsofindia.com/holi-legends/bhakt-prahlad-holika.html
PS: In some parts of our country, on Holi Pornima, Holika Dahan is celebrated i.e. the next day is 'Dhulwad' is celebrated and on the fifth day from Pornima Rang Panchmi i.e. festival of colours is celebrated. Where as in some parts of our country the festival of colour is celebrated for five days i.e. from Holi Pornima till Panchami.