Photoshop can use a small pixels make the image pixels big?

I find the pixel image is too low, it is not clear, the desktop is so vague.I would like to do one thing clear.Ps can be used?
Please explain it in detail
Thank you

first transfer format, ps deal with the bitmap is not a vector, and can not be the same clear image, can only do a little better, ways:After the unlock image in the right-point level on points, click the formation of new smart image layer, and then transform the free will Zoom picture better, but not the same image and clear! Photozoon used to really lose the basic picture to enlarge the basic tools can not, as is the really.It seems like the mosaic, PS do not have this feature