Which service is primarily focused on protecting web applications in Alibaba Cloud?

The Web Application Firewall (WAF) is specifically designed to protect web applications from various security threats. It functions by filtering and monitoring HTTP traffic to and from a web application, offering a shield against common vulnerabilities and attack vectors such as SQL injection, cross-site scripting, and other online threats. The WAF analyzes requests and responses, enabling it to block malicious traffic while allowing legitimate user requests to proceed.

This service is crucial for maintaining the security and integrity of web applications, as it can mitigate risks in real-time and adjust its defense mechanisms based on patterns of attacks. Additionally, WAFs play a key role in compliance with security regulations, as they can help demonstrate that appropriate measures are in place to safeguard sensitive data.

In contrast, the other options serve different purposes: Key Management Service (KMS) focuses on managing encryption keys, the Content Delivery Network (CDN) is primarily concerned with distributing content to improve load times and performance, and the Database Security Service is dedicated to securing databases rather than web applications directly. Each of these services has vital functions in an overall security architecture, but the WAF distinctly specializes in the protection of web applications themselves.