Keywords in SEO play a pivotal role in boosting your online presence. However, let's delve deeper and understand, what exactly is a keyword in SEO.

In online advertising, a keyword is a particular term or expression that people type into search engines when they are trying to find a specific service, product or information. SEO heavily is based on the use of these keywords to position websites.

The essence behind SEO keywords lies in their ability to link what users are searching for to the content that you’re offering on your website. Wisely using these keywords will help lure the right audience and enhance the likelihood of turnover.

Having established the concept of an SEO keyword, let's look at methods for efficiently using keywords. Optimizing the use of keywords calls for a balance. You'll want to include relevant keywords to get the attention of search engines but not overuse your content with them.

One way is to place the keyword in your content’s headline. This not only helps in optimization, but also makes your content more likely to be relevant to the searcher's query. You should also think about using keywords in the metadata and headings of your website, as these are spots where search engines tend to look.

It's also essential to choose keywords that correlate with your audience. It means understanding the way they talk, their internet search habits and their needs.

To sum up, a well-chosen SEO keyword can serve as a more info link between what a person is looking for and the service or information you provide. It's a vital tool in achieving success in the aggressive world of digital marketing. However, success hinges on its effective and balanced use.