Which technique is NOT commonly used to optimize a website for search engines?

Ignoring keyword research is not a technique used to optimize a website for search engines and is, in fact, counterproductive to effective SEO strategies. Keyword research is essential as it helps identify what terms and phrases potential users are searching for. This understanding enables web developers and content creators to create relevant content that aligns with user queries, thereby enhancing the website's visibility and ranking on search engine results pages.

In contrast, proper use of meta tags, high-quality content, and utilizing keywords effectively are all critical strategies that positively impact search engine optimization. Meta tags can provide information about a webpage to search engines, high-quality content ensures that users find valuable information, and effective use of keywords throughout the content helps in matching the search intent of users with the appropriate results. Each of these strategies contributes to a website's overall SEO performance and its ability to attract organic traffic.