Search engine optimization (SEO) services utilise a number of tactics to improve a website’s rank in search results and are used by businesses in a variety of industries. SEO providers often create or modify website content with keywords designed to improve a site’s ranking. Some content may be visible, while other content may be hidden in the website’s code. Another tactic used to improve a page’s ranking is a process known as link building, which works by getting external websites and social media pages to link back to a business's site. By using these tools to increase the visibility of a website during a search, consumers are more likely to find and engage with the business. Many businesses choose to supplement their SEO efforts with pay-per-click (PPC) advertising to increase the likelihood of being found during searches.