Satoshi is the smallest unit of Bitcoin, named after the creator of Bitcoin, Satoshi Nakamoto. One Satoshi is equal to 0.00000001 BTC. Satoshi being a digital weight is a metaphorical way of understanding the value of Bitcoin. In traditional currency systems, value is often represented by physical objects, such as gold or paper money. However, Bitcoin is a digital currency, and its value is not based on a physical substance, but rather on the mathematical algorithms that underlie the blockchain technology. Just as physical weight is used to measure the value of gold, digital weight is used to measure the value of Bitcoin. In other words, the value of Bitcoin is based on the number of Satoshis, or digital units, that represent it in the blockchain. The blockchain is a decentralized ledger that records all Bitcoin transactions, and each transaction is recorded in Satoshis. Therefore, when you own Bitcoin, you are essentially owning a certain number of Satoshis, which represent the value of your Bitcoin holdings. The value of Satoshis in terms of traditional currency can fluctuate based on market demand and supply, similar to how the value of gold or other physical commodities can fluctuate based on market demand and supply.