What are the differences in image quality and depth of field between a lens with an aperture of f/2.8 and a lens with an aperture of f/1.8?

A lens with an aperture of f/1.8 will generally produce better image quality and a shallower depth of field compared to a lens with an aperture of f/2.8. This means that the f/1.8 lens will have sharper details and a more blurred background, making the subject stand out more prominently in the photo.