SEO involves optimizing websites to increase their visibility in organic search engine results. It is not the same as pay-per-click advertising. SEO techniques help search engines understand what a website is about so it has a better chance of being found in related searches. Real-time search engines provide search results from social media and other sources that publish content in real-time, allowing users to find information about topics as they are happening. Traditional search engines were not able to provide this type of up-to-the-minute information until Google and Bing incorporated real-time features in 2009.