A +EV bet (or +Expected Value bet) is a wager where the bettor expects to gain value over time due to the odds being in their favor.
In betting, Expected Value (EV) is a concept used to measure the average outcome of a bet if it were to be placed multiple times (a very large sample size where short term luck is removed).
A bet with a positive expected value (+EV) indicates that the bettor expects to make a profit in the long run.