No. ShipStation is not a carrier or shipping company. ShipStation is a Software as a Service (SaaS) platform where you can connect your carrier and postage provider accounts so you can create the labels for your parcels. All parcels are shipped by your individual carrier and postage providers.
ShipStation integrates with many carriers and postage providers, so you can use ShipStation to create labels for your preferred carriers. Please review our Carrier Integrations page to see which providers you can connect to ShipStation.