{tabularray} is about questions regarding the tabularray package, which is used for typesetting tables and provides much of the functionality of the outdated tabu package. It can also completely separate styles from the contents of tables, and the styles of tables can be set in keyval way. Also it supports long tables with X columns in two-column documents.
The tabularray package provides the default environment tblr which is used for typesetting tables. The package provides much of the functionality of the outdated tabu package. It can also completely separate styles from the contents of tables and the styles for tables can be set as key-value pairs (similar to TikZ/PGF). The functionality of the package combines that of several other packages such as long tables, X columns, colored cells and borders or typesetting in two-column documents.