The negative keyword tool is one of the most important features offered by PPC service providers. A negative keyword is a keyword that will not generate your ad in a search result. For example, if your company sells baseball gloves, you would want to create a Negative Keyword List revolving around the keyword “Glove”. Negative keywords could include “Winter”, “Medical”, “Latex” etc. Using this tool will help use your budget to the most relevant, qualified potential customers.