Here's why:

* High Conductivity: Silver has the highest electrical conductivity of all metals. This means it allows electricity to flow through it with the least resistance.

* Free Electrons: Silver has a unique atomic structure where electrons are loosely bound to their atoms. This allows these electrons to move freely, carrying electrical current.

While gold is also a very good conductor, silver actually surpasses it in conductivity. However, silver is more expensive and reactive than gold, making it less practical for many applications.