What is the difference between Kraken and Kraken Pro?

Can you elaborate on the distinct differences between Kraken and Kraken Pro? As a cryptocurrency investor, I'm curious to understand the key features that set these two platforms apart. Are there any limitations or benefits specific to each one that I should be aware of? Additionally, how do they compare in terms of security, trading fees, and available cryptocurrency pairs? Your insights would be invaluable in helping me make an informed decision.