All means Data about Data.
Descriptive metadata: This type of metadata describes the content and characteristics of a piece of data, - title, author, date of creation, and subject matter.
Structural metadata: This type of metadata describes the organization or structure of a piece of data, such as the relationships between different parts of the data or formatted.
Administrative metadata: This type of metadata describes the management and maintenance of a piece of data, such as its creator, copyright status, or access restrictions.
Technical metadata: such as its file format, size, or resolution. Metadata is often used to organize and manage large datasets Structured, Unstructured, Big data, Raw data and Processed data.
ETL tools can extract data from various sources, such as databases, files, or APIs, using a variety of connectivity options.
Data transformation, Data loading. Scheduling and Monitoring
-Informatica, Talend, & Data Stage.