Step 1: Understand conductivity.
Electrical conductivity is how easily a metal lets current flow. Free electrons carry the current.
Step 2: The best conductor.
Among all metals, silver has the highest electrical conductivity due to high electron mobility and very low resistance.
Step 3: Compare the metals.
The order is silver > copper > gold > aluminium. So silver beats copper, gold and aluminium.
Step 4: Why copper is used more.
Copper is cheaper than silver, so it is used for wiring even though it is slightly less conductive.
Step 5: Conclude.
The metal with the highest conductivity is silver.
Answer: Silver