Internet marketing, also referred to as online marketing, Internet advertising, eMarketing (or e-Marketing), is the marketing of products or services over the Internet.

When it applies to the subset of website based ad placements it is commonly referred to as Web advertising (Webvertising), and/or Web Marketing. The Internet has brought many unique benefits to marketing including low costs in distributing information and media to a global audience. The interactive nature of Internet marketing, both in terms of instant response and in eliciting response, are unique qualities of the medium.

Internet marketing does not simply mean building or promoting a website nor does it mean simply putting a banner ad up on another website. Effective Internet marketing requires a comprehensive strategy that synergizes a given company's business model and sales goes with their website function & appearance, focusing on their target market through proper choice of advertising type, media, and design.

When talking "Internet Marketing",  Seach Engine is one of the most effecient tool for users and web developers to utilize. How to optimize Seach Engine becomes an increasingly important issue for both sides to master.

The initialism "SEO" can also refer to "search engine optimizers" or "Search Engine Optimizician", terms adopted by an industry of consultants who carry out optimization projects on behalf of clients, and by employees who perform SEO services in-house. Search engine optimizers may offer SEO as a stand-alone service or as a part of a broader marketing campaign. Because effective SEO may require changes to the HTML source code of a site, SEO tactics may be incorporated into web site development and design. The term "search engine friendly" may be used to describe web site designs, menus, content management systems, URLs, and shopping carts that are easy to optimize.