what is the difference between search engine marketing and internet marketing ?

Search engine marketing is the way to promote your website. This is to increase the ranking of the website in search engine results page. Internet marketing is like online advertising of your website or product. Internet marketing, also known as web marketing, online marketing, webvertising, or e-marketing, is referred to as the marketing (generally promotion) of products or services over the Internet.

Hello..
Search engine marketing (SEM) is a form of internet marketing that involves the promotion of websites by increasing their visibility in search engine results pages (SERPs) through optimization (both on-page and off-page) as well as through advertising...
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Search engine marketing is to build up and improve the visibility of your site to search engines, while internet marketing is a way to promote or market a certain business, service or product on the world wide web.

I think that both are same thing.

I don't think these are same thing. Search engine marketing is an internet marketing strategy.

Search Engine Marketing (SEM) is a part of Internet Marketing Services.By Search Engine Marketing we can promote products and services of a company by marketing the company's website, on the Internet and various Search Engines like Google and Yahoo.The marketing and promotion of a website is achieved by raising its visibility and ranking in the result pages of Search Engines.

Search engine marketing is to build up and improve the visibility of your site to search engines, while internet marketing is a way to promote or market a certain business, service or product on the world wide web.

Search Engine marketing is when you promote your site and get top ranking in search engine results.
Internet Marketing is when you promote your business and get real clients.