A powerfull compute box, similar like having an small AWS datacenter in a physicall box, it is a petabyte-scale data storage and transport. A Snowball edge can be installed on-premises, it is a up to 100TB data transport solution that finally goes to AWS S3. A snowballmobile is a truck with a bucn on snowball edges on it. It transfer up to 100PB of data.
Basically an import/export aws solution for on-premises.
This service is US only available.