(You keep your stake, so you'll end up with $150 in your pocket if you win.)
Moneyline bets are essentially bets on one thing to happen, usually the team to win. Let's say you're looking at two teams competing in a sporting event. There are few key types of bets: Betting odds example: Moneyline These are negative/positive values that indicate how much a bettor can win based on a $100 bet.
Reading betting odds on your standard sportsbook in the US, you'll probably be looking at American odds.