Wi-Fi has improved a lot over the years, with each new standard offering faster speeds and better coverage. The early 802.11b was pretty slow, but then 802.11g made things more reliable and faster. After that, 802.11n brought significant improvements in range and stability. Then 802.11ac came around with gigabit speeds on the 5 GHz band, which was great for streaming and gaming. The latest standard, 802.11ax or Wi-Fi 6, focuses on supporting more devices at once without slowing down. Besides speed, encryption is really important to keep data safe. WEP was the first encryption method but is now outdated and insecure. WPA improved security, and WPA2 became the standard for a long time with stronger encryption. Now, WPA3 offers even better protection, especially against password guessing attacks. As the book points out, using old Wi-Fi standards or weak encryption can leave networks vulnerable and slow.