Sentiment Analysis is application that is changing the ecommerce and many other businesses around the world. It is mainly an application related with text mining and works with the integration of machine learning algorithms(ML) and deep learning algorithms. It is used to increase the business productivity and also to better the customer experience by providing meaningful data out of unstructured data. This paper explains different ways and levels to do sentiment analysis and also explains Natural Language Processing(NLP) and its different approaches. Therefore, this paper brings an overview on sentiment analysis and different techniques and approaches integrated with it.

Lexicon, Machine Learning, NLP,Semantic Analysis, Keyword Spotting

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