Keywords in SEO play a pivotal role in enhancing your visibility online. So what exactly is an keyword in SEO? Let's break it down.

In internet marketing, a keyword is a word or phrase that users enter into search engines when they are seeking a certain service, product or information. Search engine optimization (SEO) heavily is based on the use of these keywords for website ranking.

The power behind SEO keywords lies in their ability to link what users are searching for to the content that is available on your website. Wisely using these keywords will help pull in the right audience and enhance the likelihood of turnover.

Having established the definition of an SEO keyword, let's look at the efficient use of keywords. Improving the use of keywords demands a balance. You'd want to include relevant keywords to attract search engines but not overly saturate your content with them.

One way is placing the keyword in your content’s headline. This not only helps in optimization, but also makes your content more relevant to the searcher's query. Also, consider using keywords in the meta description and headers of your website, as these are places where search engines often look.

It's also here essential to choose keywords that resonate with your targeted market. This signifies understanding how they communicate, their search behaviors and their demands.

In summary, a well-chosen SEO keyword can act as a bridge between the user's query and your online content. It's a essential tool in achieving success in the aggressive world of digital marketing. However, its full potential can only be unlocked when used correctly.