Online Marketing is the big overall umbrella term for all types of online marketing efforts:
Search Engine Marketing
Referrers and Links
E-Mail & Newsletters
Banner Advertising
SEM (Search Engine Marketing) consists mainly of Search Engine Optimisation (
SEO) and the Pay-per-click advertising offered by most search engines like Google, MSN and Yahoo! SEM refers to any kind of marketing offered relating to the search engines (SE).
Traffic from SE's is probably the most important type of traffic for most webmasters. People who are searching for your services obviously have a need for them and to find you. All you have to do is appear in front of them so that they can visit your site
SEM is very different from traditional marketing - it's not a broadcast medium. You are not shouting at or trying to vie for the attention of a few people out of thousands. Mail shots, TV, Radio and newspaper advertising works by trying to appeal to a small percentage of a large readership. SEM appeals to the majority of the readership because they've created the content or brought themselves to it.
The biggest problem facing many web owners is that they often don't understand or want to understand
SEO. They also feel that they have a given right to appear or that Google has a duty to show their website