Catenate

Catenate[{list1, list2, ...}] yields a single list with all elements from the listi in order.

Catenate[{assoc1, assoc2, ...}] yields a list of all values in order appearing in the associations associ.

Examples

Catenate multiple lists:

Catenate[{{a, b}, {c, d, e}, {f}}]
(* {a, b, c, d, e, f} *)

Catenate associations:

Catenate[{<|"a" -> 1|>, <|"b" -> 2|>}]
(* {1, 2} *)

Please visit the official Wolfram Language Reference for more details.