A Data Mart is a focused subset of a larger data warehouse, designed to serve the specific needs of a particular business unit or department, such as sales or marketing. It contains relevant data that helps users analyze and make decisions without sifting through the entire data warehouse. By organizing data in this way, organizations can improve efficiency and speed up access to important information. Data Marts can be created using various methods, including top-down or bottom-up approaches. In the top-down method, data is extracted from the main data warehouse, while the bottom-up approach builds the Data Mart independently before integrating it into the larger system. This flexibility allows businesses to tailor their data analysis to their unique requirements.