This is a core block and thus available by default in Gutenberg WordPress editor. No download required.
The WordPress Columns Block in Gutenberg allows you to organize your content in multiple columns. You can create as many columns as possible. You can add any number of Gutenberg blocks inside each column.
Columns Block Feature
The columns block toolbar has alignment options. And from the sidebar settings, you can adjust the number of columns. Consider this as a container block as you can insert other blocks inside it.
An example of what can be achieved with a column block.
This is how it looks when you first insert a column block.
Columns block sidebar has options to adjust the number of columns. You can go beyond 6 columns as well.