Introduction:
Wi-Fi security protocols are used to protect wireless networks from unauthorized access and ensure the confidentiality and integrity of the data transmitted over the network. Among the various protocols available, WPA2 is the most widely used protocol for Wi-Fi security.

Explanation:
- WPA (Wi-Fi Protected Access): WPA is a security protocol that was introduced as an improvement over the older and less secure WEP (Wired Equivalent Privacy) protocol. It was designed to address the vulnerabilities and weaknesses of WEP.
- WPS (Wi-Fi Protected Setup): WPS is a network security standard that allows users to easily establish a secure connection between a wireless device and a Wi-Fi router without the need for entering complex passphrases. It provides a convenient way to set up Wi-Fi connections, but it also introduces security risks if not properly implemented.
- WPA2 (Wi-Fi Protected Access 2): WPA2 is an advanced security protocol that provides stronger encryption and better security compared to WPA. It is based on the IEEE 802.11i standard and uses the AES (Advanced Encryption Standard) encryption algorithm.

Reasons for WPA2 being more used:
1. Security: WPA2 provides stronger security compared to WPA. It uses the AES encryption algorithm, which is considered highly secure. WPA2 also implements more advanced authentication and key management mechanisms, making it more resistant to various attacks.
2. Compatibility: WPA2 is backward compatible with older devices that support WPA. This ensures that both older and newer devices can connect to the same Wi-Fi network using the same security protocol.
3. Industry Adoption: WPA2 has been widely adopted by the industry as the standard for Wi-Fi security. Most modern Wi-Fi routers and devices support WPA2, and it is the recommended security protocol for securing wireless networks.
4. Vulnerabilities in WPS: WPS, although convenient, has been found to have vulnerabilities that can be exploited by attackers to gain unauthorized access to Wi-Fi networks. Therefore, many security-conscious users and organizations disable WPS on their routers, making WPA2 the primary security protocol.

Conclusion:
WPA2 is the most widely used Wi-Fi security protocol due to its superior security, compatibility with older devices, industry adoption, and the vulnerabilities associated with WPS. It provides a strong and reliable security solution for protecting wireless networks and ensuring the privacy and integrity of the transmitted data.