Shield is a managed Distributed Denial of Service (DDoS) protection service that protects your AWS apps.
You can also get a better version of Shield for $3000 a month called Shield Advanced, where you have more protection and 27/7 support with AWS.
WAF (Web Application Firewall) helps protect your web apps against common web exploits.
Make web ACLs to define rules for incoming traffic to protect it against attacks.
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