Can you mention the difference between SEO and SEM?

[smmexpertss]

When you begin contemplating SEO vs. SEM, it's important to keep your desired results in mind. Both are means toward attracting customers, and use very different tactics to do so. SEO revolves around a focus on bringing your company's sales site in line with what search engines want. Google and other major engines are concerned with delivering the top content to users, and they tend to feature sites with clear navigation and easy-to-understand benefits for searchers. SEM relies on creating quick, clear advertisements and bidding on keywords that prospective customers will likely enter into search engines. Companies that focus on SEO vs. SEM should keep in mind that the benefits of both include increased conversion and click-through rates.