Text mining (or digital text analysis) is the process of using digital tools to search for, extract and analyse text data.
Text mining techniques may provide insight into patterns and tendencies in large volumes of text.
There are many tools and packages developed for text mining.
One very user-friendly tool, which several students have been happy to get to know, is Voyant Tools.
Voyant is a free, open source and web-based tool, so there is nothing you have to install.
It is developed by scientists and has an extensive documentation and help site.