Most wireless routers have 4 ports to connect your device via Ethernet. Some have as many as 7. The modern routers typically support all the various 802.11 standards to support older devices with th 802.11b standard, but also support the newer 802.11n and even the 802.11ac standard which have higher throughput. Most routers use the Broadcom chipset including the Apple Airport Extreme Base Station, Buffalo Airstation, Cisco Linksys and Netgear N900. The major manufacturers include Apple, Buffalo, Linksys/Cisco, Netgear and also other including Asus, Trendnet, Western Digital, ZyXel and other smaller players.
Most should support IPv6 though not all will. Routers also have built in firewall to provide security and prevent your devices from easily attacked by security threats. Most support UPnp and DLNA to allow for multimedia streaming. You can also login to the router to configure firewall settings, port mapping, wireless encryption, password and others. Many provides a way for you to login to the router via a browser through the router own internal IP address or a routerlogin web address such as www.routerlogin.net on Linksys routers. The web based interfaces makes it easy to manage the device.
Choosing a router can be really confusing and PCMagazine has a good articles that lists the top 10 best wireless routers. For easy out of the box set up, Apple Airport Extreme comes in as the best choice. For gamers and people who needs lots of video streaming, the high throughput of the NetGear N900 Gigabeat Router capable of 450Mbps is definitely a great choice. If you have need a travel router to bring with you on the go, then the smaller and cheaper MWR102 router from Zyxel would be a good choice. For business class capabilities, the Asus RT-66CU with its external antennas and built in VPN server support is preferred by business users.