One of the forms of text analysis is sentimental analysis. As the name suggests this technique is used to figure out the sentiment or emotion associated with the underlying text. So if you have a piece of text and you want to understand what kind of emotion it conveys, for example, anger, love, hate, positive, negative, and so on you can use the technique sentimental analysis. Sentimental analysis is used in various places, for example:
To analyze the reviews of a product whether they are positive or negative
This can be especially useful to predict how successful your new product is by analyzing user feedback
To analyze the reviews of a movie to check if it's a hit or a flop
Detecting the use of bad language (such as heated language, negative remarks, and so on) in forums, emails, and social media
To analyze the content of tweets or information on other social media to check if a political...