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Your website will appear in the organic search results "Free"
search engine marketing (SEM)Your website will appear in the paid Ads area "not free"
Search Engine Marketing is how the advertisers get their advertising (message) in front of the user who are searching online. Actually, SEM is paid search results and it requires search engine managements tools for example AdWords , and Double Click. You pay for every time your advertising appears on the search engine results and get clicked by the user . You may pay using CPC , vCPM, CPA and others based on your goals.
While the search engine optimization is the required change and improvement on the website so it ranks higher in the organic search ( not paid search). These improvements are made by the webmaster on the actual website such as improve the webpage content, decrease the load time,etc. i.e when you need SEO you don't pay to the search engine to increase your website rank, you only need improvements.
Search Engine Optimization [SEO] is a process of optimizing your website inorder to get Free traffic-which is Organic or natural from search engines. This is a long term but efficient way of promoting your website and increasing your traffic.
Search Engine Marketing [SEM] is one of the Online Marketing types which is used to gain traffic using paid and Unpaid Efforts. SEO can be said as a part of SEM. SEM involves everything related to the search marketing. This can be Pay Per Click, Online AD's and so on
SEO is Technique to get Organic visits to your website or business and SEM is overall process which consists SEO , PPC , Display etc technique which attract paid and organic overall traffic to make a broader digital marketing presence for your website or business.
Both are used for the same purpose to increase traffic/audience/visitor on your website. Both SEO & SEM help you to rank higher in the Google search results and help you to come on the top of the Google page. Different techniques and strategies are used in SEO. Two types of SEO are white hat seo and black hat seo. Black hat seo is not recommended technique in SEO. SEM is marketing through paid advertisements and link building on social media sites like facebook, Google plus, twitter etc.
Search engine optimization SEO : We are making something from the scracth to fill the first result of a search qurey, which is well suits our motto. this is an organic process, there is no control over it, however some
Search engine marketing SEM : We are paying for the first place of the search result for the same query, which suits our motto. we have the full control over it.
SEM – an online marketing strategy that involves getting traffic, paid and unpaid, from the search engines
According to Wikipedia, 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 and advertising.”
SEO – a means of optimizing your website so that you get organic (free) traffic from the search engines
SEO , meaning that : optimiz website for search engine
SEM meaning : paid traffic ( such as google adwords)