There is no denying that human language is complex and diverse. Each region has its own dialects, syntax rules and slang, both verbally and in writing. The same languages these days we are trying to teach machines as everyone needs their machines to talk. Natural language processing (NLP) is a crucial artificial intelligence technology that helps resolve uncertainty in language. It complements useful numeric structure to the data for many applications such as voice technology or speech recognition.

These days everyone needs their machines to talk, and the only way by which a computer can communicate is through Natural Language Processing (NLP). Take the case of Alexa, a conversational item by Amazon. An inquiry is passed to it by the mode of voice, and it can answer by a similar medium, i.e., voice. The market situation of NLP is quite promising. The buzz of NLP in the market is increasing in an aggressive way which is expected to reach the mark of $ 16 billion by 2021 with the compound growth rate of 16 % yearly.