Interest Rate Models are essential components of lending and borrowing protocols that dictate how interest rates are set for loans and deposits. These models can be categorized into fixed rates, where the interest remains constant over the loan term; variable rates, which fluctuate based on market conditions; and algorithmically determined rates, which adjust dynamically based on supply and demand metrics within the platform. The purpose of these models is to ensure fair pricing for borrowers and lenders, promote liquidity in the market, and optimize the overall user experience in decentralized finance (DeFi) ecosystems.