The paper reviews the concept of big data, emphasizing its importance in various modern fields and the challenges associated with collecting, storing, processing, and analyzing massive datasets. It describes the five characteristics of big data known as the 5V's: volume, velocity, variety, veracity, and value, and outlines the phases of big data analytics (BDA) including data generation, acquisition, processing, querying, and analysis. The document further details the tools and techniques essential for each phase to enable effective data analysis and informed decision-making.