15 of the best keyword research tools on the market reviewed and rated.

A complete guide to using Google's Keyword Planner for SEO keyword research, content optimization and topic ideas.

A complete guide to using Google's Keyword Planner for SEO keyword research, content optimization and topic ideas.

Keyword research is quite possibly the most important part of SEO. You cannot begin to plan for a campaign unless you know which phrases you are targeting, and you cannot estimate costs and returns from SEO unless you first know who you’re competing against.

The AdWords Keyword Tool has been retired! Here are our eight favorite keyword research tool for SEO and PPC keyword research.

To reach the top of the SERPs and stay there, your website must deserve to be there. It needs to be the best in class. It must offer the best user experience in that niche. Fortunately, a number of free tools can help you achieve that goal.

To reach the top of the SERPs and stay there, your website must deserve to be there. It needs to be the best in class. It must offer the best user experience in that niche. Fortunately, a number of free tools can help you achieve that goal.

To reach the top of the SERPs and stay there, your website must deserve to be there. It needs to be the best in class. It must offer the best user experience in that niche. Fortunately, a number of free tools can help you achieve that goal.

To reach the top of the SERPs and stay there, your website must deserve to be there. It needs to be the best in class. It must offer the best user experience in that niche. Fortunately, a number of free tools can help you achieve that goal.

To reach the top of the SERPs and stay there, your website must deserve to be there. It needs to be the best in class. It must offer the best user experience in that niche. Fortunately, a number of free tools can help you achieve that goal.