The King's Gambit is a chess opening that begins:

1. e4 e5
2. f4
White offers a pawn to divert the Black e-pawn and build a stronger center with d2-d4. Theory has shown that in order for Black to maintain the one pawn advantage, moves must be made that seriously weaken the position of the Black pieces. King's Gambit is one of the oldest documented openings as it was examined by the 17th century Italian chess player Giulio Polerio.[1] It is in an older book by Luis Ramirez de Lucena [2] The King's Gambit is now rarely seen at the master level. Black can obtain a reasonable position by relinquishing the extra pawn at a later time and consolidating defensively.  The King's gambit may either be accepted (black takes the f pawn) or declined

hi tonydal, I found this in chessgame.com  1.e4  e5   2.f4  exf4   3.Nf3  d5

its the most annoying black opening when i play the King's Gambit.

I think you took it from wikipedia:

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King's Gambit

From Wikipedia, the free encyclopedia

This article uses algebraic notation to describe chess moves.

King's Gambit
Moves	1.e4 e5 2.f4
ECO	C30-C39
Origin	no later than 16th century
Parent	Open Game
Chessgames.com opening explorer

The King's Gambit is a chess opening that begins:

1. e4 e5

2. f4

White offers a pawn to divert the Black e-pawn and wants to build a stronger center with d2-d4. Theory has shown that in order for Black to maintain the one pawn advantage, moves must be made that seriously weaken the position of the black pieces. King's Gambit is one of the oldest documented openings as it was examined by the 17th century Italian chess player Giulio Polerio.^[1] It is in an older book by Luis Ramirez de Lucena.^[2] The King's Gambit is now rarely seen at the master level. Black can obtain a reasonable position by relinquishing the extra pawn at a later time and consolidating defensively."