Hey does anyone know how this feature affects the image if it is turned off? I am confused with this one.
Bascially there is an invisible grid over your image that affects your image when you're moving layers/objects. It can also mean that layers and objects will snap to each other when you're moving them. It's useful for making pixel perfect designs (you can setup measurements in preferences) but I usually have it turned off.
Hope that helps :)
Snapping is a useful feature in Photoshop that allows users to align layers, shapes, text, etc, perfectly with other objects, guides, or in our case the grid.
To enable Snap to Grid, first Enable Snap (View > Snap), and then make sure Snap to Grid is checked (View > Snap To > Grid).