Imagine a world where people can share records, verify transactions, and build trust without depending entirely on a single person or organization.

Sounds interesting, right?

That is one of the big ideas behind blockchain technology.

Blockchain is often associated with Bitcoin, cryptocurrencies, and Web3. But its underlying concepts go much further. They can help us understand new ways to record transactions, track products, share data, and automate agreements.

You do not need a technical background to understand it.

Let's start with a simple story.

1. The Story of Rahim's Grocery Shop

Imagine a small village in Bangladesh. Rahim owns a grocery shop where he sells rice, vegetables, cooking oil, and other everyday products.

Like many small business owners, Rahim keeps track of his sales and debts in a notebook.

One day, Karim visits his shop and buys groceries worth $500.…