SEO (Search Engine Optimization) is a way of earning traffic through unpaid or free listings by targeting keywords and online content which are web pages and other content such as videos or local listings that are shown and ranked based on what the search engine considers most relevant to users.

SEM (Search Engine Marketing) is the process of gaining traffic and visibility from search engines through both paid and unpaid efforts. It encompasses both earning traffic through unpaid or free listing and buying traffic through paid search listings.

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