Rather than having to get cash, pay into the casino, and later transfer out the chips in person, everything can be handled automatically through an easy-to-use website. Online gambling has increased in technology in recent years, giving people the ability to play all types of games.
While slot machines remain the most popular type of gambling both online and offline, new technology makes it possible to even play multi-player games like blackjack and poker. Online dealers are able to log into websites to run tables, and some advanced online gambling sites even have video feeds.
But how do people know that online gambling is fair? In fact, the randomness technology that is used in online gambling is virtually identical, in technology, to real life machines. In real life, slot machines are designed to pay out based on an algorithm that pays out a specific percentage of time. While it's not known when that payout will occur, it is known that slot machines will pay out that percentage. The percentage is calculated to make sure a gambling company doesn't go out of business, but to give a huge cash payout to the lucky winner!
Online slot machines are calculated exactly the same way, they just don't have the physical hardware of the slot machine. The software is the same, which means that online gambling still has the same overall likelihood of paying out as a real-life gambling machine. It's just easier and more convenient to use.
Of course, with blackjack, poker, and other card-based games, you'll be playing against real players and consequently the odds are going to be based on the table. Many people make a living playing online poker for exactly that reason! When you play online card games, you can't see in-person tells. Instead, everything is usually based on statistics, risk assessments, and the way that people are playing.