Big data analytics is a powerful tool used by companies like Facebook and Google to analyze huge amounts of data for making important decisions. This technique helps solve complex problems in areas like cyber security, healthcare, and marketing. By using technologies like Hadoop and Spark, big data analytics can handle large and unstructured data effectively. The challenges of big data are summarized in six V's, and case studies show how it can be applied to text, voice, video, and network analytics. Overall, big data analytics has the potential to bring positive changes to fields like education, healthcare, and business in the future.