Any data that does not conform to predefined standards, and lacks structure or architecture is called unstructured data. It is not organized into rows and columns – making it more difficult to store, analyze, and search. They are not stored in a relational database and access is tough. Examples include raw Internet of Things (IoT) data, video and audio files, social media comments, and call center transcripts. Unstructured data is usually stored in data lakes, NoSQL databases, or modern data warehouses.