Trustlessness can be defined as the state where the two transacting parties do not have to trust each other before getting into a deal. For example, usually, this trust is based on personal experience. Whenever the parties interact at scale, this trust is often outsourced to a third party, like banks or insurance companies. However, Blockchains instill this trust without relying on third parties. This trust is by the design of the Blockchains. Let us make it real. Imagine you are selling property. You would involve legal authorities that will validate the purchase, banks that would finance the transaction, and law enforcement agencies that will make sure that bank transfers and ownership transfers happen simultaneously. Blockchains can overcome this process by writing a smart contract that will lock in the ownership representation from the seller and money from the buyer and swap it without fail each time. Apart from that, blockchains can be trusted because of the following:  Blockchains are highly compatible with other business applications due to their open-source nature.   Since it is an immutable data ledger, anything on Blockchain can be proven at any time.   It also improves efficiency and speed.   It is safe and hack resistant.