First of all we need to know about what big data is. So, in a simple word, we can say that big data is a collection of large volume structured or unstructured data with have various information asset. Big data is a concept of V3 that belong to volume, velocity and variety. Big data is analysed for the insight of data that lead to a better decision of an organisation. Big data is on demandable for every organisation and that is the reason people wants to learn