Stamps.com Inc. is a provider of Internet-based mailing and shipping solutions in the United States. The Company offers mailing and shipping products and services to its customers under the Stamps.com, Endicia, ShipStation, ShipWorks and ShippingEasy brands. It operates through the Internet Mailing and Shipping Services segment. Under the Stamps.com and Endicia brands, customers use its United States Postal Service (USPS) only solutions to mail and ship a range of mail pieces and packages through the USPS. USPS mailing and shipping solutions enable users to print electronic postage directly onto envelopes, plain paper, or labels using only a standard personal computer, printer and Internet connection. The Company offers USPS mailing and shipping services, multi-carrier shipping services, mailing and shipping services, branded insurance and international postage solutions. The Company offers customized postage under the PhotoStamps and PictureItPostage brand names.