Internet marketing, also referred to as i-marketing, web-marketing, online-marketing or e-Marketing, is the marketing of products or services over the Internet.
Internet marketing also includes marketing done via e-mail and wireless media. Management of digital customer data and electronic customer relationship management (ECRM) systems are also often grouped together under internet marketing.
Internet marketing also refers to the placement of media along many different stages of the customer engagement cycle through search engine marketing (SEM), search engine optimization (SEO), banner ads on specific websites, e-mail marketing, and Web 2.0 strategies.
Business models

E-commerce -consumers (B2C) or businesses (B2B)
lead-based websites
affiliate marketing(e-commerce business, single person, or a combination)
blackhat marketing-less than truthful methods
One-to-one approach-search marketing,peers
Appeal to specific interests-according to age group, gender, geography, and other general factors
Geo-targeting-location, organization, Internet Protocol (IP) address, ISP or other criteria.