Unless you have an artificial Christmas tree or none at all, you'll need to safely dispose of your live tree after the holidays. First things first: Don't burn it in your fireplace! This can contribute to creosote buildup in your chimney, and most Christmas trees will dangerously pop and spark in a fire.
You have several ways to recycle your tree, which I wrote about here.
Beyond that, you have several other options. Most towns offer curbside tree pickup for a few weeks following Christmas. Call or Google your municipal office for info. Many nonprofits, such as the Boy Scouts, offer pickup services for a small donation, like $5. Look out for fliers around town for these services or search for them online. Or, drive your tree to a dropoff recycling center; most counties have several locations. Next year, considering getting a live, rooted tree, which you can then plant in your yard after Christmas!