The main reason why Data Science is important because we collect more and more data (from mobile devices, sensors, etc.) and that the storage of data is cheap. Thus, there are huge amount of data that can be analyzed to understand the past or predict the future, and support decision making. Analyzing data by hand is time-consuming. Hence, the field of data mining has become an important research area as it can allow analyzing a large amount of data.
If you want to know more about Data Science then do check out Intellipaat’s Data Scientist which will help you in learning Data Science from scratch and also provides one-to-one mentorship.
And if you are more into videos then you can check out this video tutorial which will help you in learning Data Science from the beginning:
And if you are beginner and more into reading blogs then you can check out this blog which will provide you a brief introduction to Data Science.