therefore, SEO basically relates to private, natural website optimization and search engine marketing are generally recognized as advertising through a pay per click listings. SEO help to increase your website traffic. SEM increase their traffic through the paid Ads in search engines.

SEM stands for Search engine marketing is a tool of Internet marketing that means how to advertisements of websites that improved the visibility of search engine results pages (SERPs) basically for paid advertisements. SEM is just like processed as search engine optimization (SEO) is also works to improve website ranking in SERPs, SEM is also modified or edits website content and site design to get a higher ranking in search engine results pages to improve paid advertisement.
Search engine marketing is just like an SEO because that they both work with digital marketing strategies on search engines like Google and Bing. But, SEO simply relates to fresh content means not copied, fresh content website optimization, therefore, search engine marketing is generally known as advertising by Search engine marketing (SEM) is similar to SEO in that they both processed same.