Understanding What a Blockchain Is
Blockchain is a digital system that records transactions in a secure and transparent way. Instead of storing data in one place, it keeps copies across many computers.
How Blockchain Works
When a transaction happens, it is grouped with others into a “block.” Once verified, that block is added to a chain of previous blocks. This creates a permanent and tamper-resistant record.
Why Blockchain Is Secure
Every block is linked using cryptography. Changing one block would require changing every block after it, which is extremely difficult. This makes blockchain reliable and resistant to manipulation.
Where Blockchain Is Used
Blockchain is most famous for powering cryptocurrencies, but it is also used in supply chains, digital identity systems, and secure data tracking across industries.
The Simple Takeaway
A blockchain is a chain of digital records stored across many computers. It is secure, transparent, and designed to keep information accurate and hard to tamper with.