The Labouchere betting system is a method used in gambling, particularly in games like roulette and sports betting, to manage wagers and potentially recover losses. It operates on a concept of creating a sequence of numbers that represent the desired profit. Players begin by determining their target profit and writing down a series of numbers that sum to that amount. To place a bet, the player sums the first and last numbers in the sequence, wagering that total. If the bet wins, those two numbers are removed from the sequence. If the bet loses, the total wagered is added to the end of the sequence.