Search Marketing – is a term that refers to both paid and unpaid search activities. It is used as an umbrella term for SEO and Search Engine Marketing (SEM). Both are online techniques for increasing a brand or product’s visibility to audiences using search engines to find information.
Be careful with this last term: SEM is just about paid ads and does not include SEO. It is a marketing method that focus on ads displayed on the search engines results, typically appearing on the top or on the right of the SERP. Basically, the higher the bid one offers to pay for an ad, the higher the ad will be on the page, depending of the degree of competition.