Browser Games are electronic games that are played on web browsers. They are distinct from other video and computer games in that they typically do not require any client side software to be installed, apart from the web browser. There are games that rely solely on client-side technologies such as JavaScript or common plugins such as Java or Flash Player, whereas some employ server-side scripting. The latter case consists typically of (massive) multiplayer games, whereas the client-side games are typically single-player games. A game played in a browser is often called a browser-based game.
source: wikipedia.com
So that's basically what browser games are. Most browser games can be played on the net for free and are usually single player games. Flash games are one of the most popular browser games on the net. These games are usually short games.
