xSP is a broader term which includes different type of Service Providers who provide their services through internet.
How xSP does works?
xSP includes those vendors who provide their services using a common mode which is internet.
Each xSP is meant for providing different type of services.
Some of the common xSPs are ASP (Application service provider), HSP (Hosting service provider), ISP (Internet service provider), CSP (Cloud service provider) etc.
How and where xSP is used?
Each xSP is used to provide different type of services related to their domain of use.