What are the differences between a lens with an aperture of f1.4 and a lens with an aperture of f1.8?

The main difference between a lens with an aperture of f1.4 and a lens with an aperture of f1.8 is the amount of light that can enter the lens. A lens with an aperture of f1.4 allows more light to enter compared to a lens with an aperture of f1.8. This means that the f1.4 lens can produce brighter images and is better suited for low-light conditions. Additionally, a lens with a wider aperture like f1.4 can create a shallower depth of field, resulting in more pronounced background blur or bokeh in photographs.