AdWords is a Google service that uses keywords to target the delivery of advertisements to people who are searching for a particular product or service. Advertisers choose keywords and key phrases they want their ads associated with, then their ads appear alongside Google search results and on web pages with information related to that keyword. AdWords appear as clean, simple text and are clearly identified as promotional, thereby respecting and enhancing web users efforts to find useful information. Google AdWords offers cost-per-click pricing, so advertisers only pay when an ad is clicked on. Advertisers can take advantage of an extremely broad distribution network, as ads can appear alongside Google.com search results, with search results on Google’s partner sites, and on targeted content pages on leading websites. Participants can choose the level of support and spending as is appropriate for their business. AdWords is available on a self-service basis, in which advertisers control the details of their campaign, creative, keyword choices, and daily budget via online tools and with email support. Advertisers with more extensive campaigns and budgets can receive strategic services, which include an account team of experienced professionals that help them set up, manage, and optimize their campaigns.
Affiliate Marketing is a method of promoting Web businesses in which affiliates are rewarded for every visitor, subscriber, customer, and or sale provided through their efforts. Compensation or commission varies. It may be made based on a certain value for each impression, click, registrant or new customer, sale, or any combination of them. The merchants are typically referred to as affiliate merchants and the publishers are referred to as affiliates. Relationship between an online merchant and the affiliate is called an affiliate program.
Algorithm is a complex mathematical formula used by a search engine to rank the web pages that it finds by crawling the web. Basically, it is a set of rules that a search engine uses to rank the listings contained within its index, in response to a particular query. No search engine reveals how its own algorithm works, to protect itself from competitors and those who wish to spam the search engine. That is why the algorithm of all search engines is a part of trade secrets. It is very important for search engines to keep it as such, because many people try to reverse engineer the code and understand how they work. In most cases these are attempts to help websites rank higher in search engine results.
Alt tag was an HTML alt attribute specified within an image tag. It was created at the birth of the Web. Most computers were using dial up services, and the pages were loading very slow, especially when the site was loaded with images. Internet surfers could turn off images and still see the description of the image as an alternative text. The text in the alt attribute will be displayed in the place of the image while the image loads or if the user has images turned off. In most browsers the text also appears as a tool tip when the user hovers the mouse pointer over the image after it has loaded. Creating an alt attribute for images is optional even now. Yet, it is recommended since the alt text is factored into the algorithms of most search engines. Keyword-optimized Alt attributes are now used to improve the search engine rankings. Including alternative text is a very important for usability purposes. They make web pages accessible to people with disabilities. In addition, these tags are important to search engines, as they look for the presence of your keywords in the three first ALT tags on your page. Therefore, the presence of keywords in these tags can significantly improve page rankings. In the case of image links, it seems to have weight akin to anchor text.
Web Metric is a quantative measurement of statistics describing events or trends on a website.
Key Performance Indicator (KPI) is a metric that helps the website owner understand how he is doing against his website objectives

