Data size refers to the amount of digital information stored in a file or database, typically measured in bytes. Common units of measurement include kilobytes (KB), megabytes (MB), gigabytes (GB), and terabytes (TB). Understanding data size is essential for managing storage capacity and ensuring efficient data processing. The size of data can impact performance, as larger files may take longer to transfer or process. For example, a video file in HD quality will generally be much larger than a text document. Knowing the data size helps users make informed decisions about storage solutions and data management strategies.