Network topology refers to the layout pattern of interconnected devices or nodes in a computer network. It defines how different devices are connected to each other and how data flows through the network. There are several types of network topologies, each with its own advantages and disadvantages. Here are some common ones:

1. Bus Topology: In a bus topology, all devices are connected to a single backbone cable called a bus. Data is transmitted in both directions along the bus. However, if the backbone cable fails, the entire network can be affected.

2. Star Topology: In a star topology, each device is connected directly to a central hub or switch. All data passes through the hub, which helps to isolate problems to individual devices. However, if the hub fails, the entire network can be affected.

3. Ring Topology: In a ring topology, each device is connected to two other devices, forming a closed loop. Data travels in one direction around the ring. While this topology is relatively simple, the failure of a single device can disrupt the entire network.

4. Mesh Topology: In a mesh topology, each device is connected to every other device in the network. This provides redundant paths for data to travel, which can increase reliability and fault tolerance. However, it can be expensive and complex to implement.

5. Hybrid Topology: A hybrid topology combines two or more different topologies into a single network. For example, a network might use a combination of star and bus topologies to create a more scalable and fault-tolerant system.

6. Tree Topology: A tree topology combines aspects of both bus and star topologies. Devices are arranged in a hierarchical structure, with multiple levels of branching. This topology can be scalable and provides some fault tolerance.

7. Meshed Star Topology: This is a variation of the star topology where each device is connected to a central hub as well as to other devices directly. It provides redundancy similar to mesh topology but is less complex.

8. Point-to-Point Topology: In this simple topology, two devices are directly connected to each other. It's commonly used for temporary connections or for connecting two distant locations.

The choice of network topology depends on factors such as the size of the network, the cost, the desired level of redundancy and fault tolerance, and the type of applications being used on the network. Each topology has its own strengths and weaknesses, and the best choice for a particular situation will vary accordingly.