This chapter provides a thorough introduction to Big Data along with an emphasis on its main features: volume, velocity, variety, and veracity. Key technologies and techniques for handling and evaluating vast amounts of data, including data storage options, processing systems, and analytical tools, are covered. Emphasizing its ability to spur innovation and efficiency, the chapter investigates Big Data’s influence across industries like healthcare, banking, retail, and smart cities. It also addresses newly developing themes such as quantum computing, blockchain integration, and edge computing. At last, the chapter covers the value of ethics, data privacy, and the developing skill set needed by experts in the sector.