The D&D Adventurers League campaign can be played anywhere, including the World Wide Web. Players and Dungeon Masters need only follow the same rules and guidelines for creating characters, running AL-legal games, and recording rewards as any other Adventurers League game.
Popular virtual table tops include Fantasy Grounds (officially licensed by Dungeons & Dragons), Roll20, or D20Pro. Some groups play using Skype, Google Hangouts, Discord, or any application that allows multiple people to chat online. The “Find a Game” section of this site has tips for finding on online Adventurers League game.