Big data is generated from a variety of sources like web data, purchases, social networks, sensors, and IoT devices. Telecom companies process exabytes and zettabytes of data daily, including call detail records, network configuration data, and customer information. This big data is analyzed to enhance customer experience through personalization, predict churn, and optimize networks. Analytics also helps with operations, data monetization through services, and identifying new revenue streams from IoT and M2M data. Frameworks like Hadoop and MapReduce are used to analyze this distributed big data across clusters in a distributed manner for faster insights.