class Cucumber::Core::Test::DataTable

it internally and pass them to your Step Definitions.
You don't typically create your own DataTable objects - Cucumber will do
or an Array of Hash
Creates a new instance. +raw+ should be an Array of Array of String

def initialize(rows)
  raw = ensure_array_of_array(rows)
  verify_rows_are_same_length(raw)
  @raw = raw.freeze
end