The three major frequency bands used for Wireless LANs are the 2.4 GHz, 5 GHz, and 60 GHz bands. Each band has its own unique characteristics that make it more or less suitable for different applications.

2.4 GHz: The 2.4GHz band is the most commonly used frequency band for wireless LANs due to its wide coverage area and low cost of implementation. However, this band is also subject to interference from other devices such as microwaves and cordless phones which can lead to reduced performance.

5GHz: The 5GHz band offers a higher data rate than the 2.4GHz band but has a shorter range due to its higher frequency. This band is less prone to interference than the 2.4GHz band but can be more expensiveto implement due to poorer signal propagation in buildings and other obstacles.

60GHz: The 60GHz frequency offers the highest data rates of any of the WLAN frequencies, however it does not penetrate obstacles as well as the lower frequencies and therefore has a shorter range. This frequency is not susceptible to interference from other devices making it ideal for high density deployments in areas where there are many users sharing the same space.