SWIRE is the Spitzer Wide-area InfraRed Extragalactic Legacy Survey. SWIRE is the largest of six Legacy Surveys being carried out for the benefit of the astronomical community by teams selected by the Spitzer Science Center. SWIRE has imaged 49 square degrees of the sky (equavalent to the area covered by about 250 full moons), covering six different regions which have been carefully selected to be the best possible infrared fields for detecting faint infrared galaxies and quasars.SWIRE is the Spitzer Wide-area InfraRed Extragalactic Legacy Survey. SWIRE is the largest of six Legacy Surveys being carried out for the benefit of the astronomical community by teams selected by the Spitzer Science Center. SWIRE has imaged 49 square degrees of the sky (equavalent to the area covered by about 250 full moons), covering six different regions which have been carefully selected to be the best possible infrared fields for detecting faint infrared galaxies and quasars.