Unlike balls used in regular bingo halls, online bingo sites use a random number generator. Online bingo halls usually offer online casino games as well as the bingo, but the actual bingo play works almost exactly like playing online poker or online casino games, with everything being virtual. One notable feature of online bingo is the chat functionality. Successful online bingo sites foster a sense of community and interaction between players.

Some operators require players to download free software to play their games. Other operators use Java or Flash based games that allow you to play immediately online after registering a player account.

To win the largest prizes, users must fund an account, but free bingo games are also available offering players a way to win smaller amounts of money with no risk of gambling. Some online bingo sites offer no deposit bingo with sandbox play. This will allow the player to get the hang of the system without a cash investment, but no monetary value can be gained.

There are two types of bingo played around the world. North America plays 75-ball bingo on a 5x5 card with the centre square usually marked 'free'. In the UK, parts of Europe, Australia and parts of South America they play a 90-ball game, marked on a 9x3 card. Both types of bingo are prominent online.

The desired pattern which players aim to achieve in 75 ball can vary dramatically, from a simple single line to more complicated themed patterns. The aim of the game, however, is always the same: to mark off the numbers to achieve the desired pattern. Speed Bingo is a variation played exactly the same, but numbers are simply called much quicker.

In 90-ball bingo, each card has three horizontal lines and nine columns. Each line contains five numbers, meaning each card has 15 numbers. The first column contains numbers from 1 -10, the second column contains numbers from 11-20, all the way through to the final column which contains numbers from 81-90.

A game of 90 ball bingo will normally be played in three stages: one line, two lines and Full House. In a one line game players need to mark a complete horizontal line across one card (i.e. 5 numbers marked). The aim of a two lines game is to complete any two marked lines horizontally across one card (i.e. 10 numbers marked). Finally a Full House means all the numbers marked off on one card (all 15 numbers), as in a regular coverall game. The prize split differs for each stage of the game. The Full House is always the largest prize in any one game.

The Chat application brings a different dimension to gaming. This is where all the players of a game can meet and chat during games of bingo. Whereas in land-based bingo where talking is strictly forbidden during a game, it is actively encouraged in online bingo. Chat functions as an effective retention tool, aimed especially at the predominantly female audience.

CM stands for chat monitor. The CM works for the bingo site as the host of a chat room and plays a role in welcoming players and creating a friendly and communal atmosphere in the room. This includes, but is not limited to, congratulating players when they win a game as well as playing chat games in-between bingo. Most sites have a chat protocol known as chat etiquette or chatiquette.