You probably use machine learning dozens of times a day without even knowing it. A simple web search on Google works so well because the ML software behind it has learnt to figure out which pages to be ranked and how. Similarly, you are saved from wading through a ton of spam in your email because your computer has learnt to distinguish between spam & a non-spam email.
Machine learning is a smart alternative to analyzing vast amounts of data. Based on the tasks performed and the nature of the output, you can classify machine learning models into three types:

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