  WiFi was designed just to replace the wired connections, but it has changed
the Internet as a whole. WiFi users are increasing day by day and the traffic
from wireless devices is dominating the Internet. With an increasing number of
users and their expectations on QoS(Quality of Service) and data rates, there
is a need for better WiFi techniques which can support the above-mentioned
challenges. The IEEE LAN/MAN standards committee (LMSC) has launched new
protocols like IEEE 802.11ac, 802.11ad, and 802.11ax. Understanding them is
very important to use them efficiently and effectively to fulfill our
expectations. In this paper, we summarize few of the works which talk about the
above the mentioned protocol standards of WiFi that brought a significant
improvement in WiFi's performance. Moreover we discuss the differences in the
protocols and their applications. We also try to compare these three protocols
with respect to their supported data rates, range of transmission and
Robustness.
