KPI: (Key Performance Indicator)
A Key Performance Indicator (KPI) is a measurable value that demonstrates how effectively a company is achieving key business objectives. Organisations use KPI's to evaluate their success at reaching targets.
This is the practice of cramming your desired keywords into your content in hopes of ranking higher in search engines. However, Google is one step ahead and has started blacklisting websites they think are adopting this technique. Coherent, natural language is the best way to go.