Search engine optimization (SEO) is the process of promoting a website through search engines by developing content that matches the search intent of the target audience, including keywords, content type, angle, and SERP features. A tool like Ahrefs Keyword Explorer helps you find keywords with specific SERP features so you can focus your content on them. How well your content matches search intent largely determines how it performs on SERPs.
SEO is important for increasing brand visibility, capturing TV ad traffic, and selling ecommerce products. It also reduces the cost of customer acquisition and raises the lifetime value of customers. A successful SEO strategy connects your business with people searching for the products or services you offer and positions your brand as a trusted resource, which drives the brand awareness any SEO program aims for.
How SEO works: the basics
Title tags and meta descriptions are central to SEO. These tags should be around 160 characters long, tell searchers what the content is about, and include a call-to-action. Images contribute too: they raise user engagement and add information to a page, and meta descriptions are read by Google when crawling pages.
The strongest SEO strategies are tailored to the dominant search engines in your target market. Search engines use complex mathematical algorithms to decide which websites are most relevant to a query. In 2003, Google represented about 75% of all searches, and it is still the leading search engine worldwide. By June 2008, Google held a nearly 90% market share in the UK.
How search engines rank pages
Search algorithms analyze billions of pages and consider hundreds of ranking factors. A thicker web of links between pages makes it easier for Google’s spiders to reach every page and judge relevance. The more pages a site has on the Internet, the more chances it has of ranking highly.
Google uses more than 200 ranking factors, and they are not equal in weight. Page load time is a major factor, but content quality matters far more. Sitemaps are vital for helping search engines crawl your site, and Google’s Quality Guidelines are a useful starting point.
Why SEO matters more in 2026
SEO is a fast-paced industry, and keeping up with changes is critical for any campaign. You may want to hire an SEO firm with a history of working with Fortune 1000 companies. As more information moves online, the importance of SEO keeps growing. Brands that invest in SEO are more likely to connect with a larger audience and generate more leads, while brands that ignore SEO fall behind.
FAQ
What is SEO?
SEO, or search engine optimization, is the process of promoting a website through search engines by developing content that matches the search intent of the target audience, including keywords, content type, angle, and SERP features.
Why is SEO important for businesses?
SEO increases brand visibility, captures TV ad traffic, supports ecommerce sales, reduces customer acquisition costs, raises customer lifetime value, and connects businesses with people searching for their products or services.
How does Google rank pages?
Google uses more than 200 ranking factors across billions of pages. Content quality matters far more than individual technical factors, though page load time is a major signal, and sitemaps help Google crawl a site effectively.