What is maker fee in Kraken?

Could you please elaborate on what exactly is meant by the term 'maker fee' when it comes to trading on the Kraken platform? As a cryptocurrency enthusiast, I'm interested in understanding the intricacies of trading fees and how they impact my transactions. Is the Maker fee a fixed amount or does it vary based on certain factors? Additionally, how does the maker fee compare to the taker fee, and what are the implications of being classified as a maker or a taker in terms of trading efficiency and cost savings?