What is the difference between Wi-Fi B and Wi-Fi C?

Could you please elaborate on the differences between Wi-Fi B and Wi-Fi C? I understand that they are both wireless networking standards, but I'm not quite clear on the specific advancements or limitations of each. Are there any notable differences in terms of speed, range, or compatibility with devices? Additionally, are there any security improvements in Wi-Fi C compared to Wi-Fi B? I'd appreciate your insights on this topic.