What is a fianchetto in chess and how does it impact a player's strategy on the board?

A fianchetto in Chess is when a player moves their bishop to a long diagonal square, usually on the b2 or g2 square for White, or b7 or g7 square for Black. This impacts a player's strategy by controlling key central squares and providing support for the player's pieces to attack the opponent's position. It can also help in creating a strong defense and preparing for future attacks on the board.