gigabits per second

https://bravo-wiki.win/index.php/Why_You_Need_a_Reliable_File_Size_Converter_for_Kilobyte_and_Gigabyte_Conversions

Gigabits per second is how fast networks transfer data—think streaming 4K video or downloading a game in seconds. It’s the speed that makes buffering a thing of the past, but your device matters too; even the fastest plan lags behind an old router.