Pineapple plants are a type of Bromeliad, and the pineapples themselves are the fruit of the plant. Bromeliads are special because each plant only ever bears one fruit. So once the pineapple itself is past its best, keep the parent plant and watch for it producing baby plants around the base. Given the right care and conditions, each of the new baby plants will produce a new pineapple, and those plants in turn will produce new plants...
Pineapples love warm, sunny conditions. Keep it at warm room temperature, ideally between 22 and 28 degrees Celcius.