Brining is soaking the turkey in a salt water(brine) solution for at least 24 hrs.
Supplies: To properly brine a turkey you need to start the night before you plan to cook. You will need at least 10 to 12 hours (plan on 1 hour per pound), a container large enough to hold your turkey and enough brine to cover it. You'll also need salt, water, sugar, seasonings, and enough room to refrigerate it. A large stainless steel stock pot or even a 5 gallon clean plastic bucket would make excellent containers. Whatever container you choose the turkey needs to have enough room to be turned so it should be big. Both Reynolds (Oven Roasting Bag for Turkeys) and Ziploc (XL Storage Bag) make very large food safe resealable bags that are great for brining.