Garden fences come in many shapes and sizes and there could be several reasons for putting up a garden fence such as security, privacy, defining boundaries, keeping pests out etc. The obvious reason for a garden fence is to provide a degree of privacy and security.
High, strong and difficult to see through these are the qualities generally people want in wooden fences. Wooden fences tend to make the best domestic fences. They blend in more with the garden and offer good privacy from noisy neighbors.