Definition
ASICs are custom silicon chips engineered exclusively for Bitcoin mining. Unlike general-purpose CPUs or GPUs, every transistor in a mining ASIC is dedicated to computing SHA-256 hashes. This specialization makes ASICs orders of magnitude faster and more energy-efficient than any other hardware for mining.
Modern Bitcoin ASICs like the BM1366 and BM1370 from Bitmain operate at extremely small process nodes (5nm and below) and can compute trillions of hashes per second while consuming relatively little power. The evolution from CPU to GPU to FPGA to ASIC mining reflects the natural progression toward specialization in a competitive market.
In Simple Terms
A specialized chip designed exclusively for Bitcoin mining, far faster and more efficient than general-purpose hardware.