SEO techniques are specific methods used to improve the visibility of a website or web page in search engines. Some common techniques include optimizing title tags, meta tags, header tags, increasing the use of relevant keywords, and adding fresh, original content to a site. The various tags and keywords associated with SEO help search engines identify and index a site or web page for relevant searches. Keeping fresh content continually updated also helps, as it shows search engines that a site is active, relevant, and likely to provide the intended results for users.