Structured Data: Structured data is data that can be organized by structured categories, such as rows and columns in an Excel spreadsheet or a database. For example, accounting records are structured data because you can organize them by customer, by geography, by product, etc. Structured data is typically stored in a database and can be queried using query languages such as Structured Query Language (SQL). Most data was predominantly structured until 2000 but since then we have seen an explosion of unstructured data. Today, structured data accounts for less than twenty percent of the world’s data.