$BTC "BTC" generally refers to two different things:

* Bitcoin: It is the world's first and most well-known cryptocurrency or digital currency. It operates through blockchain technology without the control of any central bank or government. Bitcoin is used for P2P (peer-to-peer) transactions and its value fluctuates based on market demand and supply.

* Bangladesh Trade and Tariff Commission (BTC): It is a governmental agency of Bangladesh. It mainly works on determining import duties, protecting domestic industries, and preventing the dumping of foreign products. It operates under the Ministry of Commerce.

If you clarify which "BTC" you wanted to know about, I can provide more specific information.