English In sports betting, a banker (or "bank" in some cases) is a term referring to the most reliable bet in a parlay or a series of bets. The probability of winning this bet is considered extremely high. Normally, when a player includes a "banker" in their parlay, the other bets may be riskier, but this selection is added as a guaranteed or almost guaranteed win, which increases the overall chances of the entire parlay succeeding.
It is important to understand that, even with a "banker", a win is not guaranteed at 100%, but it is generally seen as a low-risk bet. To place a risk-free bet, you can use the arbitrage betting strategy.