ASIC

An ASIC (application-specific integrated circuit) is a chip designed to do exactly one job — in crypto, computing a specific mining algorithm as fast and efficiently as possible. Unlike a general-purpose CPU or GPU, an ASIC miner cannot browse the web or render graphics; it exists only to run a hash function such as Bitcoin's SHA-256, which it does orders of magnitude more efficiently than consumer hardware.

For example, a modern Bitcoin ASIC performs hashing measured in terahashes per second, while a gaming GPU running the same algorithm would be so slow that its electricity cost would vastly exceed any reward. This efficiency gap is why Bitcoin mining is now an industrial activity dominated by purpose-built machines in facilities with cheap power, rather than something done on home computers.

A common misconception is that ASICs can be repurposed when mining a coin becomes unprofitable; in reality an ASIC built for one algorithm is useless for anything else, so its resale value tracks the profitability of that one coin. Some cryptocurrencies deliberately chose "ASIC-resistant" algorithms to keep mining accessible to GPU owners, with mixed success — profitable algorithms tend to attract ASIC designs eventually. The ASIC arms race has trade-offs: it concentrates manufacturing among a few companies, but it also anchors network security in expensive, single-purpose hardware that attackers cannot easily rent.