Types

Formulating your SEO strategy requires that you know how your target audience is searching on Google. This is where keyword research tools come in. While the big tools like SEMrush and Ahrefs provide deep keyword analysis, the price of these tools make them beyond the reach of your average business owner. A good keyword tool will allow you to input a keyword, and provide you with a list of related keywords, which are analyzed for how many searches are conducted, the level of competition for the keyword, and advertising metrics such as cost-per-click rates. While results can't be 100% accurate - as Google's raw data isn't available - a reasonable estimate is provided by a number of companies, some of which offer a free trial, or a free tier of usage.

Software used to create video games. They are also used to create simulations, teaching tools, and other interactive software.

A cryptocurrency is a digital currency that uses cryptography to securely allow transfer and storage of monetary value. Typically a cryptocurrency will be designed so that it does not require a central authority to function, such as a bank or company.

A product currently, or previously, available for purchase.

Books. Physical or eBooks.

These tools audit your site in order to uncover any problems that may be hindering its performance in search engines. They usually provide you with a report on your site's performance against various issues known (or rumored) to effect search engine performance, allowing you to optimize your site to increase organic traffic. Many companies, large and small, provide this kind of tool, typically for a price, and quality varies wildly.