If all your data is stored on your computer, and it starts on fire, all your data is lost. Or, someone could hack in and change the data. Blockchain prevents this by distributing ledgers of recorded data across a decentralized network of computers, so there's no single point of vulnerability. Once data is recorded, it can't be edited or deleted. 

And that's kinda the point of it all: Creating systems that are transparent, have the same rules for everyone, and cannot be changed after the fact. 

Through decentralization. It's really at the heart of this whole "crypto experiment." A world where access to money and information is democratized - available and  cost free ... for everyone. 

Today, we exchange our personal data to participate in today's internet (Web 2.0). Google, Facebook, and other big companies make billions by selling your data in exchange for access to their services.   

The goal is to eliminate third party intermediaries when exchanging anything valuable... goods, services, assets, etc. Strangers doing business can trust code to facilitate transactions as intended.  

The next iteration of the internet, Web 3.0, will be decentralized. No more exchanging personal data for access to apps and websites...they will run on blockchain networks powered by cryptocurrency.

Did you know Visa doesn't issue any credit cards? Not one. Visa is a centralized network where data is transferred to confirm you have money, and then moves that money from your account to another. 

Visa and Mastercard charge a fee to use their networks...and made over $60 Billion doing so last year. Decentralized payment networks eliminate the need for that type of third-party cost and control.  

Cryptocurrency is what powers decentralized blockchains. Computers on the blockchain need to use computing power to facilitate transactions and are incentivized to do so by being rewarded in crypto.