A single jump in a new suit by responder eg 1♦-Pass-2♠. The bid is normally forcing to at least game unless made by a passed hand. In the modern style, responder usually has either a very good suit or support for opener’s suit or a semi-balanced hand with stoppers in the unbid suits.
By a passed hand, a jump shift promises near opening values, a fair suit and primary support for opener. Example hands for the sequence given are: