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Analysis of sentiment is a method of retrieving the information or emotions of peoples about any product or service. We can use data from social media platforms, blogs, product reviews websites and E-Commerce websites for using this data for analysis purposes. So, by this process we can get thinking or feelings of others that helps us in decision making. Various machine learning techniques can be applied on this data for getting useful insights that helps in decision making. This paper discusses and compares various machine learning and non-machine learning sentiment analysis techniques, applications, and challenges.
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