1.General: Organization, business or individual which offers service to others in exchange for payment.

A telecommunications service provider or TSP is a type of communications service provider that has traditionally provided telephone and similar services. This category includesincumbent local exchange carriers, competitive local exchange carriers, and mobile wireless communication companies. While some people use the terms "telecom service provider" and "communications service provider" interchangeably, the term TSP generally excludes Internet service providers(ISPs), cable companies, satellite TV, and managed service providers.
The need for ASPs has evolved from the increasing costs of specialized software that have far exceeded the price range of small to medium sized businesses. As well, the growing complexities of software have led to huge costs in distributing the software to end-users. Through ASPs, the complexities and costs of such software can be cut down. In addition, the issues of upgrading have been eliminated from the end-firm by placing the onus on the ASP to maintain up-to-date services, 24 x 7 technical support, physical and electronic security and in-built support for business continuity and flexible working.
The importance of this marketplace is reflected by its size. As of early 2003, estimates of the United States market range from 1.5 to 4 billion dollars. Clients for ASP services include businesses, government organizations, non-profits, and membership organizations

A Storage service provider (SSP) is any company that provides computer storage space and related management services. SSPs also offer periodic backup and archiving.
Advantages of managed storage are that more space can be ordered as required. Depending upon your SSP, backups may also be managed. Faster data access can be ordered as required. Also, maintenance costs may be reduced, particularly for larger organizations who store a large or increasing volumes of data. Another advantage is that best practices are likely to be followed. Disadvantages are that the cost may be prohibitive, for small organizations or individuals who deal with smaller amounts or static volumes of data and that there's less control of data systems.

An Internet service provider (ISP) is an organization that provides services for accessing, using, or participating in the Internet. Internet service providers may be organized in various forms, such as commercial, community-owned, non-profit, or otherwise privately owned.
Internet services typically provided by ISPs include Internet access, Internet transit, domain nameregistration, web hosting, colocation.