In any data science project life cycle, cleaning and preprocessing data is the most important performance aspect. Say if you are dealing with unstructured text data, which is complex among all the data, and you carried the same for modeling two things will happen. Either you come up with a big error, or your model will not perform as you expected. You might have wondered how the modern voice assistance system such as Google Assistance, Alexa, Siri can understand, process and respond to human language, so here comes the heavy lifter. i.e., Natural Language Processing.