What is Search Engine Marketing (SEM)?

It's a paid marketing on search engine like PPC and display ads

it is a paid for google marketing

Search Engine Marketing(SEM) is a method of promotion and advertising to help companies’ content rank higher among Search Engine Traffic. Like search engine optimization (SEO), search engine marketing (SEM) helps companies improve the way content is ranked by search engines. Search Engine Marketing helps companies bring their products and services to the attention of audiences who are ready to buy.

Search Engine Marketing is the internet marketing that uses for the promotion of the websites on search engine results pages by paid adverstisement.

Search Engine Marketing is a part of digital business promotion.

Search engine marketing is a very broad term, If you know, in Search Engine Optimization, you are doing on-page and off-page SEO for improving your website ranking in the search results in organic ways. Whereas in SMM, your basic intention is getting traffic anyhow. You are getting traffic by doing SEO i.e. organic ways and by running paid ads. Thus, SMM involves SEO and is a broader term; that is used to get traffic.

Search engine marketing is a form of Internet marketing that involves the promotion of websites by increasing their visibility in search engine results pages primarily through paid advertising.