An Internet hosting service is a service that runs Internet servers, allowing organizations and individuals to serve content to the Internet. There are various levels of service and various kinds of services offered. A common kind of hosting is web hosting. Most hosting providers offer a combined variety of services. Web hosting services also offer e-mail hosting service, for example. DNS hosting service is usually bundled with domain name registration.
Web hosting technology has been causing some controversy lately as Web.com claims that it holds patent rights to some common hosting technologies, including the use of a web-based control panel to manage the hosting service, with its 19 patents. Hostopia, a large wholesale host, recently purchased a license to use that technology from web.com for 10% of retail revenues. Generic, yet rather powerful, kinds of Internet hosting provide a server where the clients can run anything they want (including web servers and other servers) and have Internet connections with good upstream bandwidth.
A free web hosting service is a web hosting service that is free, usually advertisement-supported. Free web hosts will usually provide a subdomain (yoursite.example.com) or a directory (www.example.com/~yourname). In contrast, paid web hosts will usually provide a second-level domain along with the hosting (www.yourname.com). Many free hosts do allow use of separately-purchased domains. Rarely, a free host may also operate as a domain name registrar.

An internet advertising agency is a service business dedicated to creating, planning and handling advertising (and sometimes other forms of promotion) for its clients that available on internet services. An ad agency is independent from the client and provides an outside point of view to the effort of selling the client’s products or services. An agency can also handle overall marketing and brand positioning strategies and sales promotions for its clients. Interactive marketing agency may differentiate themselves by offering a mix of web design/development, search engine marketing, internet advertising/marketing, or e-business/e-commerce consulting. Interactive agencies rose to prominence before the traditional advertising agencies fully embraced the Internet. Offering a wide range of services, some of the interactive agencies grew very rapidly, although some have downsized just as rapidly due to changing market conditions. Today, the most successful interactive agencies are defined as companies that provide specialized advertising and marketing services for the digital space. The digital space is defined as any multimedia-enabled electronic channel that an advertiser’s message can be seen or heard from. The ‘digital space’ translates to the Internet, kiosks, CD-ROMs, DVDs, and lifestyle devices (iPod, PSP, and mobile). Interactive agencies function similarly to advertising agencies, although they focus solely on interactive advertising services. They deliver services such as strategy, creative, design, video, development, programming (Flash and otherwise), deployment, management, and fulfilment reporting. Often, interactive agencies provide: digital lead generation, digital brand development, interactive marketing and communications strategy, rich media campaigns, interactive video brand experiences, Web 2.0 website design and development, e-learning Tools, email marketing, SEO/SEM services, PPC campaign management, content management services, web application development, and overall data mining & ROI assessment.