For Example: Why is it said that blockchain can change the world?

Because it can change the way people interact. Thanks to this technology, two people who do not know each other and who have never made contact have a system to trust each other. The importance of blockchain is that it generates trust without the need for an intermediary. This decentralized model puts in the center a new axis that supposes a change in the traditional model of distribution of wealth. We have let the genius of the digital lamp escape, which has given us a technology that allows us to take a step further in the transformation of society. @bunnypuncher