Silver is the best electrical conductor among metals at room temperature.
Its electrical resistivity is lower than that of copper, gold, and aluminium under ordinary conditions. Silver’s mobile electrons can move through its crystal lattice with relatively little resistance, giving it the highest electrical conductivity of any element at room temperature.
Copper is used far more widely in household wiring because it is much less expensive and remains highly conductive. Aluminium is also important for long-distance power lines because it is lightweight and reasonably conductive. Gold conducts less well than silver or copper, but it resists corrosion, making it useful for reliable contacts and connectors.
Silver’s high price prevents it from replacing copper in most large-scale wiring. It is nevertheless used in specialized electrical contacts, printed conductors, solar cells, and some high-performance applications. Conductivity changes with temperature, so comparisons must specify conditions.