Switch is a device manage network packet between one device to another.  home network today usually have router + switch together.

Beside normal packet routing, Smart Switch allow you manage filter/Vlan and QOS.

Wireless network usually use AP as switch.

The way to select switch are

1. Port number : how many device you need to connect to switch. 24 - 48

2. Function : QOS needs? Vlan needs?

3: Admin consol:  remote admin ? local admin

4: security:  MAC filter? address learning ?