SEO means Search Engine Optimization. For this you don't need to pay Google, Facebook, Yahoo or any other channels. You will do this by your own or an expert can help you to get better ranking in search engines. Basically you might pay to someone but not some channels.
On the other hand, SEM means search engine marketing where you pay Google, Bing, Yahoo, or other search engines to display your keywords or ads at the top of organic search results or on the side section or sometimes on the bottom sections of organic search results.
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