Columns and column groups accept only four styles: border, background, ____, and visibility.

Grouping columns allows you to have multiple levels of columns in your header and the ability, if you want, to 'open and close' column groups to show and hide additional columns.

Grouping columns is done by providing the columns in a tree hierarchy to the grid. There is no limit to the number of levels you can provide.

The list of Columns in grid Options. column Defs can be a mix of Columns and Column Groups. You can mix and match at will, every level can have any number of Columns and Column Groups and in any order. The difference in Column vs Column Group definitions is as follows:

The children attribute is mandatory for Column Groups and not applicable for Columns.
If a definition has a children attribute, it is treated as a Column Group. If it does not have a children attribute, it is treated as a Column.
Most other attributes are not common across groups and columns (eg groupId is only used for groups). If you provide attributes that are not applicable (eg you give a column a groupId) they will be ignored

Learn more about column groups here

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