How Online Games Work: A Beginner’s Guide

What Is an Online Game?

An online game is a game that uses a network connection for one or more connected features. The exact requirements vary considerably. Some games can operate offline and only use the internet for multiplayer features, while others depend on online services for almost everything beyond the initial application.

From the player's perspective, an online game usually appears straightforward. A player opens the application, chooses an activity, joins a session, and begins playing. Behind this simple experience, however, multiple components may be communicating with each other.

The player's device runs the game software, often called the client. A remote server may manage shared information, sessions, player interactions, or other online services. The network provides the connection through which information moves between those systems.

The result is a shared environment where actions performed by one player can become visible to other players. This is one of the fundamental differences between a connected multiplayer experience and a completely local game.

The Main Parts of an Online Game

Although different games use different technologies, it is useful to start with four basic components. These components help explain most of the terminology beginners encounter when learning about online gaming.

What Happens When You Start an Online Game?

Starting a connected game involves more steps than simply displaying the main menu. The client may need to initialize local resources, communicate with online services, verify the current session, and retrieve information required for the player's experience.

Once a session begins, the communication can become continuous. The player generates input through a keyboard, controller, touchscreen, or another interface. The client processes that input and, when necessary, communicates relevant information to the connected systems.

Understanding the Game Client

The game client is the part of the system that the player interacts with directly. It is responsible for presenting the game world and responding to player actions.

For example, when someone presses a movement button, the client detects that input. It can immediately update elements of the local interface while also sending relevant information through the network when the game requires synchronization with other players.

The client can also perform many tasks without contacting a remote server. Rendering graphics, playing sounds, displaying menus, and processing certain local calculations are examples of work that may take place on the player's device.

Understanding the Game Server

A game server is a computer system or service that provides online functionality to connected players. Its exact responsibilities depend on the game's architecture.

In an authoritative server design, the server can act as the main source of truth for important parts of the shared game state. Clients send information about player actions, while the server processes that information and distributes appropriate updates.

This approach is useful for multiplayer games because several players need to agree about what is happening in a shared environment. If every device independently decided the complete game state, keeping players synchronized would become much more difficult.

Modern multiplayer networking can use different architectures and techniques, including client-server systems, peer-to-peer designs, state synchronization, interpolation, and client-side prediction. The appropriate approach depends on the type of game and its technical requirements.

Client vs Server: What's the Difference?

How Multiplayer Games Synchronize Players

Imagine two players are controlling characters inside the same multiplayer environment. Each player's device has its own copy of the game application, but the players need to see a reasonably consistent version of the shared world.

When Player A moves, the client detects the movement. Relevant information can be transmitted to the server. The server processes the update and can send a new game state to the connected clients. Player B's client then uses the information to update what appears on screen.

The process can happen repeatedly during a session. Fast multiplayer games therefore have to balance responsiveness, accuracy, network traffic, and server performance.

What Is Latency?

Latency is the delay involved in communicating information between systems. In gaming, it is commonly discussed when explaining why an online game may feel less responsive than an offline experience.

Suppose a player performs an action that needs to be processed by a remote server. The relevant information must travel across the network, the server needs to process it, and the resulting update may need to travel back to the player's device.

The physical distance between systems, network conditions, routing, server location, congestion, and other technical factors can affect communication time.

Common Reasons for Connection Problems

• Unstable wireless connections
• Network congestion
• Long distance to the game server
• Packet loss
• Problems with local networking equipment
• Temporary server-side issues
• Heavy network activity on the same connection

Latency, FPS, and Bandwidth Are Different

Beginners sometimes use latency, frame rate, and internet speed as if they describe the same thing. They do not.

How Matchmaking Works

Many multiplayer games include a matchmaking system that helps place players into game sessions. The exact rules differ from one game to another.

A matchmaking system can consider information such as the selected game mode, available sessions, region, party size, connection conditions, or other game-specific factors.

The purpose is to create a suitable session from the available players and servers. Once a match is formed, players can be directed to an appropriate game session.

How Game Accounts Fit Into Online Gaming

Accounts are commonly used to associate a player with online services. Depending on the game, an account can be connected with progression, achievements, settings, social features, statistics, or other information.

An account also provides a way for a service to distinguish one player from another. This becomes especially useful when information needs to remain available across multiple gaming sessions.

For example, a player may close a game and return later. If the game supports persistent online progression, the service can associate the player's saved information with the appropriate account.

How Player Progress Can Be Stored

One of the useful features of connected games is persistent progression. Instead of keeping every piece of information only on the player's device, a game may associate certain data with an online account or storage system.

Examples can include completed objectives, achievements, settings, statistics, unlocked content, or other game-specific information. The exact data model differs significantly between games.

Some games also synchronize information between supported devices. This can make it possible for a player to continue using a profile after switching devices, provided the game supports that feature.

Online Games and Updates

Connected games often receive updates after their original release. Updates can contain new features, technical fixes, balance changes, security improvements, visual changes, or additional content.

The client may need to download updated files before it can access certain features. In other situations, the server can change connected services without requiring the entire game application to be replaced.

This separation between client software and online services is one reason modern games can evolve considerably after launch.

Online vs Offline Gaming

Neither approach is automatically better for every situation. They simply use different technical models. An offline game can provide a complete experience without depending on remote services, while an online game can provide shared experiences and continuously connected features.

Why Online Games Need Efficient Networking

Games are interactive applications, so delays that might be unnoticeable in other types of software can become obvious during gameplay. A multiplayer game therefore needs to move relevant information efficiently.

Game developers may use different techniques to improve the experience. These can include sending only necessary information, compressing data, predicting local movement, interpolating between updates, and designing servers that can handle many simultaneous sessions.

The right solution depends on the genre. A slow turn-based game does not have exactly the same networking requirements as a fast competitive action game.

Different Types of Multiplayer Architecture

There is no single networking design that works for every game. Developers can choose from several architectural approaches depending on the requirements of their project.

What Happens When a Player Disconnects?

A multiplayer game needs to account for players unexpectedly losing their connection. The game may detect that the client has stopped communicating and then update the session accordingly.

Depending on the game, a disconnected player might be removed from the match, temporarily marked as unavailable, replaced by an AI character, or allowed to reconnect.

The design depends on the type of game and how important continuous participation is to the session.

Beginner Checklist for Understanding Online Games

Frequently Asked Questions