What's the difference between a white egg and a brown egg?

Excuse me, could you please clarify the distinction between a white egg and a brown egg for me? I've often heard about these two types of eggs, but I'm not entirely sure what sets them apart from each other. Is it the color of the shell? Or is there a more substantial difference in terms of their nutritional value, taste, or any other factors that might influence my choice when purchasing eggs? Thank you in advance for shedding some light on this matter.