Image denoising is a applicable issue found in diverse image processing and computer vision problems. There are various existing methods to denoise image. The important property of a good image denoising model is that it should completely remove noise as far as possible as well as preserve edges. This paper presents a review of some major work in area of image denoising. There have been numerous published algorithms and each approach has its assumptions, advantages and limitations. After brief introduction various methods have been explained for removing noise.