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AWS WAF (Web Application Firewall) is a cloud-native security service that helps protect applications from common web exploits that could affect application availability, compromise security, or consume excessive resources. It works by providing customizable rules that shield your web applications from various attack vectors, such as SQL injection and cross-site scripting (XSS). With AWS WAF, you gain granular visibility and control over web application traffic, thanks to its ability to monitor and filter request traffic based on pre-defined rules and conditions.

The service is integrated with Amazon CloudFront, AWS Application Load Balancer, and AWS API Gateway, making it easy to deploy as part of your existing AWS infrastructure. Features include rule groups, which allow you to encapsulate common protection rules, automated bot mitigation, and real-time monitoring through AWS CloudWatch metrics. AWS WAF also supports managed rule sets, allowing users to take advantage of pre-configured rules maintained by AWS and third-party partners, reducing setup time considerably. Pricing is based on the number of web access control lists (ACLs) and the number of rules you deploy, making it flexible for different use cases. Teams choose AWS WAF for its integration with existing AWS services, its cost-effectiveness, and the robust set of features that cater to varying security needs.