Big Datadata processing is a rapidly growing part of business and industry, and it can be defined as “data sets, which are unstructured or, time-sensitive or simply very large, cannot be processed by relational database engines and is beyond the ability of traditional database tools to capture, store, manage, and analyze”. This type of data requires a different processing approach called big data, which uses huge parallelism on readily-available hardware. These applicationsIt would not be possible for these applications to work without the underlying support of networking due to their extremely large volume and complexity. In other hands, Software-Defined Networking (SDN) is a new networking model that resolves the drawbacks of traditional network infrastructures. The SDN controller handles generally handles any topology in the underlying network and switching devices. In this paper, we depict the good points of SDN in solving several issues prevailing with big data applications. We show that SDN can manage the network efficiently for improving the performance of big data applications. In addition, we show that big data can benefit SDN as well, including traffic engineering, cross-layer design, defeatingdefenses against security attacks, and SDN-based intra and inter datainter-data center networks.