What are the components of internet marketing?

Components of internet marketing may include:
Setting up a website , consisting of text, images and possibly audio and video elements used to convey the company's message online, to inform existing and potential customers of the features and benefits of the company's products and/or services. The website may or may not include the ability to capture leads from potential customers or directly sell a product or service online. Websites can be the Internet equivalents of offline brochures or mail order catalogs and they are a great way to establish your business identity.
Banner advertising, which is the placement of ads on a website for a fee. The offline equivalent of this form of online marketing would be traditional ads in newspapers or magazines.
Search Engine Marketing (SEM), which is marketing a website online via search engines, either by improving the site's natural (organic) ranking through search engine optimization(SEO), buying (PPC) ads or purchasing pay for inclusion (PFI) listings in website directories, which are similar to offline yellow page listings.
Online press releases, which involve placing a newsworthy story about a company, its website, its people, and/or its products/services with on online wire service.