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What is the difference between SEO and SEM?

Author:Semrush Team

1 min read

January 10, 2025

The difference between search engine optimization (SEO) and search engine marketing (SEM) is that SEO is focused on improving a website to increase visibility in unpaid search results, while SEM uses both SEO and paid ads (often called pay-per-click ads or PPC ads) to drive traffic from search engines.

Generally, SEO helps you earn organic (unpaid) traffic over time, and SEM is an umbrella approach that helps you drive both immediate traffic and long-term traffic.

When to use SEO vs. SEM:

Further reading: SEO vs. SEM

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Semrush Team

The Semrush Team brings together AI visibility experts, SEO specialists, data analysts, and product practitioners to help businesses grow and manage their online visibility. We publish research, experiments, and practical guidance grounded in real data from the Semrush platform, covering search, content marketing, and the broader digital marketing landscape.

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