802.11n is a Wi-Fi standard introduced by IEEE in 2007 and published in 2009. It supports a longer-range and higher wireless transfer rates than its previous standard, 802.11g.
802.11n devices support MIMO (multiple in, multiple out) data transfers, which can transmit data from multiple streams simultaneously. This technology effectively doubles the range of a wireless device.
So a wireless router that uses 802.11n has twice the radius of its coverage as an 802.11g router. This means that a single 802.11n router can easily cover an entire household, while an 802.11g router may be needed to bridge the signal of additional routers.
Earlier 802.11g standard was used to support transfer rates up to 54 Mbps. But devices that use 802.11n can easily transfer data over 100 Mbps. At the same time, with an optimized configuration, it can theoretically support 802.11n standard transfer rates up to 500 Mbps, which is five times faster than a standard 100Base-T wired Ethernet network.
So even if your residence is not wired, then an Ethernet network, there is no big deal in it because wireless technology can easily compete with a wired network in terms of speed.
Also, remember that due to the faster speeds and larger range that 802.11n provides, it becomes equally important that you keep your wireless network password protected.