A very common misconception is that big data is some technology or tool. Big data, in reality, is a very large, heterogeneous set of data. This data comes more in ab unstructured or semi-structured form, so extracting useful information is very difficult. With the growth of cloud technologies, the generation rate of data has increased tremendously.
Therefore, we need a solution that allows us to process such "Big Data" at optimal speed and to do so without compromising data security. There are a cluster of technologies that deal with this and one of the best is Hadoop.