SEMRush is an enterprise SEO platform used by marketers around the world. It is deemed one of the best platforms for SEO. In SEMRush you can track keywords, monitor competitors, get content ideas and audit your websites technical SEO as a starting point.
It’s a very popular tool for SEO professionals and it’s renowned for having very powerful keyword research capabilities. Its main competitor is probably AHREFs which is on par but has slightly different features and UI.