ASIC (Application-Specific Integrated Circuit)
In short: An ASIC , or application-specific integrated circuit, is a chip built to perform one task extremely well.
An ASIC, or application-specific integrated circuit, is a chip built to perform one task extremely well. In crypto, the term usually means specialized mining devices built around such chips, which compute one hashing algorithm far faster and more efficiently than general-purpose processors.
Why it matters
On proof-of-work networks such as Bitcoin, miners compete to find valid block hashes, so energy efficiency decides who can mine profitably. ASICs made CPU and GPU mining of Bitcoin uncompetitive and greatly raised the network’s total hash rate, which makes attacks more expensive. The trade-off is concentration, since mining drifts toward operators who can buy the newest machines in bulk and access cheap electricity. ASICs are also inflexible: a device built for one algorithm cannot mine coins that use another, and older models tend to become unprofitable as more efficient ones arrive.
Example
A miner buys an ASIC designed for SHA-256, the hashing algorithm that Bitcoin uses. They give it power, cooling and an internet connection, point it at a mining pool, and receive a share of the pool’s rewards based on the work their machine contributes. The same device cannot be switched to a coin built on a different algorithm, so its usefulness is tied to the networks that rely on SHA-256.