Do you need a network switch? from Jack prabha's blog

A network switch is a simple device that houses a set number of Ethernet ports. These can be used to connect many devices with RJ45 ports. Your PC, TV, printer, consoles and other smart devices will more than likely have an Ethernet port that can be used to create a more stable connection. While Wi-Fi has come a long way over the past decade, it still doesn't beat a wired connection. Should you be happy with the wireless performance of your router, a switch probably isn't for you.

Network Switches are designed for homeowners or the office to create physically connected networks. A switch will take control over traffic management and provide some advanced network features that your ISP supplied router may lack, further enhancing performance. 

There are two types of switches on the market: managed and unmanaged. The former is for advanced users who know what they're doing and need to fine-tune settings on the switch for the network. An unmanaged switch is the better option for home-owners since it'll largely handle everything with little to no human input.