The betting odds are usually the likelihood of the occurrence of a certain result in an event and this is generally presented in the forms of fractions or decimals or the numbers are also presented with the symbol of plus or minus on the front of the numbers also called money line.
The odds are calculated as the total ratio of events that produce the outcome of the number. In Gambling, the use of odds facilitates the betting of events where the relative probabilities of the results are different. 
In situations like horse racing or football matches, when the two sides are unequally matched, betting odds provide a perspective on the likelihood of the possible results. In today’s world, almost all the betting odds take place between the individuals and the bookmakers, instead of two individuals alone.
There are three to four main types of odds and the players should always learn about the offs before starting gambling or betting as, without the knowledge of odds, it would be quite ridiculous to gamble.
The Different Betting Odds Are
The Fractional Odds or British Odds
These odds are quite popular and used in countries like Britain and Ireland. The Irish and British bookmakers highly favour this odd which makes it the most popular betting odds worldwide. The odds are presented with a hyphen or slash in between the numbers, like 4/1 and is announced as four-to-one.
The British odd represents the net total of the profit to be paid out to the bettor, relative to the stake. The numerators and denominators of the betting odds are always given in integers. Furthermore, a type of fractional odds are also known as Hong Kong odds which are quite exchangeable.
Decimal Odds 
The decimal odds are quite famous in European countries, in Australia, Canada, Singapore, and others. The decimal odds are usually equal to the decimal value of the fractional odds added with one. These odds are the ratio of the payout value including the original stake, to the stake itself.
The decimal odds can be calculated by multiplying the initial wager with the decimal value. This odd is also famous in the betting exchanges as it is easy to learn and understand and also they reflect the inverse of the probability of any outcome. The decimal odds are also known among the users with the name of European odds or digital odds.
Money Line Odds
Money line odds is also known as the American odds are quite popular among American bookmakers. Here, the odds are reflected with the symbols of plus and minus in front of the numbers. The outcomes which are less likely to happen are usually denoted with a plus symbol.
When the outcomes are more likely to occur then not occurring, the odds are called negative odds and are presented with a minus symbol. In almost all the cases, the favorite will have negative odds whereas the lesser favorites will have positive money line odds.
Wholesale Odds
When the probability of occurrence of the event is 100% then it is called wholesale odds. These are the real odds that are displayed without any bookmaker’s profit. This index is the index of all the prices in the probabilistic market.
The sports betting odds are the basics the players should learn before the start of gambling and after that, they can go for deeper knowledge about the other aspects.