A marketing program will train you in how to better understand how customers make decisions, and how they interact with market messages—which are increasingly delivered through mobile devices. Courses in market research will teach you how to segment consumers and identify changes and opportunities in customer demand. Courses in consumer behavior will train you to predict how customers will respond to different communications and incentives, and how the communication channel (print, internet, mobile, etc.) impacts the communications content.
Search Engine Marketing or SEM encompasses the steps taken to increase relevant traffic to your website, through higher rankings on search engines. Traditional SEM is made up of two processes: “organic” search engine optimization (SEO) and pay-per-click advertising (PPC) (or cost-per-click (CPC)). However, the field of SEM is a changing and expanding field thanks to constant new developments, such as:

Another reason is that if you're using an image as a link, the alt text for that image will be treated similarly to the anchor text of a text link. However, we don't recommend using too many images for links in your site's navigation when text links could serve the same purpose. Lastly, optimizing your image filenames and alt text makes it easier for image search projects like Google Image Search to better understand your images. 
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