Once you have all your big data loaded into Hadoop, the next step would be to process the data, do aggregate, apply filter and analyse the data. In short to make the business decisions from the analysis. This is where Hadoop Programming Languages like HIVE and PIG comes into the picture.
Just to collect terabytes of raw data from web logs, web content etc. would be of no use until and unless you get the way to extract meaningful data and use it in your business to gain some deep insights to make better decisions.
Here comes the powerful programming model and languages integrated in Hadoop Framework.
Several tools are built on top of Hadoop Core component layer to provide variety of ways to solve the problem of processing big data.