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As the data sets in the world are growing at an exploding rate, research and analysis to derive value from this data has gained ground. Social media is a prime contributor to this data most of which is unstructured. The growing popularity of multimedia and mobile devices has created an overgrowing interconnected network where people are communicating on-the-go, sharing opinions on public forums, blogs, social networking websites. In this context, Twitter has emerged as a major platform to share one's ideas and opinions and millions of users are `tweeting' every second to generate a continuous influx of real-time data. Organizations are tapping into this data to gauge the general opinion or sentiment among the people and methods & techniques are being proposed for sentiment analysis & opinion mining. This has emerged as an active area of research and has a wide range of applications in every field.