Bullet chess is a time control format in which each player has a very short total time — typically one minute (1+0) or slightly more with a small increment (such as 1+1 or 2+1) — to make all their moves throughout the game.
This extremely fast format fundamentally changes the nature of chess: clock management becomes just as important as move quality. A player who finds strong moves but thinks too long will lose on time, even from a winning position. Speed of execution, pattern recognition, and clock handling are skills in their own right in bullet chess.
In practice, bullet can help you accumulate a high volume of games and train your eye to spot certain tactical patterns — forks, pins, and discovered attacks. However, it should not be your main format for improvement: the reflexive habits developed in bullet (instinctive moves, lack of planning) can negatively affect your performance in rapid or classical games. Slower time controls remain essential for genuine progress.