What is meant by search engine marketing?

Will have to comment on this with the little knowledge I have of SEO. I believe the way to go is to get your website organic as possible with loads of relevant content.

What is meant by add a role? How is a role defined?

@Giby, Swagbucks host a custom search engine, similiar to Google which I always use to gain extra points for marketing it

Targeted marketing toward specific marketing groups via all search engines.

Search Engine Marketing is the ethical way to promote your website products and services and also get more visitors to your website...

Means advertising you site in a organic way to promote your products, which you can do it in several way like back linking, article writing, blogging, URL directory submitting, tweeting, etc.........

promote your online business at targeted audience. that's enough.

SEO stands for “search engine optimization.” It is the process of getting traffic from the “free,” “organic,” “editorial” or “natural” listings on search engines. All major search engines such as Google, Yahoo and Bing have such results, where web pages and other content such as videos or local listings are shown and ranked based on what the search engine considers most relevant to users. Payment isn’t involved, as it is with paid search ads.

Search engine marketing is the process of increasing website traffic and high ranking on search engines through paid and unpaid efforts...

By Search Engine Marketing you get more visitors & ROI on your products/services.