What’s the difference between the 802.11ac WiFi standard and previous versions?

The 802.11ac WiFi standard was introduced to enable more reliable and higher performance networking tasks like streaming HD video, playing online games without lag, or migrating large amounts of data in a shorter time span. Compared to the previous 802.11n WiFi standard, it uses a wider RF bandwidth up to 160 MHz (instead of 40 MHz) and allows the use of up to 8 x MIMO streams (instead of 4).
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