Surebet (or Arb) is a situation in sports betting that occur due to inconsistency in the odds of different bookmakers, and leads to a bettor's win regardless of the outcome of a sports match. [!] In this article, the terms "Surebet" mean the same thing as the term "Arbitrage situation". These are equivalent concepts.
Sure betting does not mean that you place bets on high favorites, but rather exploit differences in the odds with different bookmakers. Sure bets are basically played by placing bets with several bookmakers who give different odds on the different outcomes of a game.