Sentiment analysis is a text analysis method that detects polarity (e.g. a positive or negative opinion) within the text, whether a whole document, paragraph, sentence, or clause.
Sentiment analysis aims to measure the attitude, sentiments, evaluations, attitudes, and emotions of a speaker/writer based on the computational treatment of subjectivity in a text.
Why is Sentiment Analysis difficult to perform?
Though it may seem easy on paper, Sentiment Analysis is a tricky subject. A text may contain multiple sentiments all at once. For instance,
“The acting was good , but the movie could have been better”
The above sentence consists of two polarities!!!

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Sentiment Analysis Using Vader
2.75 GEEK