Stablecoins are a type of cryptocurrency that is created and backed by other assets such as fiat currency, gold, cryptocurrency, shares etc. Although there are also uncollateralized stablecoins which we know as algorithmic stablecoins (for example UST), the value of UST is maintained by algorithms and smart contracts and stability is also maintained by a centralized mechanism so it is possible that uncollateralized stablecoins will fluctuate. Basically, stablecoins with collateral from other assets will be very useful for their users,