What is the drop rate in Splinterlands?

I'm curious, could you elaborate on the concept of "drop rate" in Splinterlands? Is it a metric that indicates the frequency of certain items or rewards being obtained by players? How does it impact the overall gameplay experience and economy of the game? Is there a specific formula or algorithm that determines the drop rate, or is it more of a subjective measure? Additionally, are there any strategies or methods that players can employ to potentially increase their chances of obtaining higher drop rates? I'd love to gain a deeper understanding of this aspect of Splinterlands.