[Modify/Add] Add IAM Access Analyzer Doc.

Add info about IAM Access Analyzer

README.md

@@ -39,7 +39,7 @@ Each Section contains a number of units. **Below Table Link** containing informa
 - [VPC](sections/vpc.md)
   - VPC & Subnets Primer, Internet Gateway & NAT Gateways, Network ACL & Security Groups, VPC Flow Logs, VPC Peering, VPC Endpoints, Site to Site VPN & Direct Connect, Transit Gateway
 - [Security & Compliance](sections/security_compliance.md)
-  - AWS Shared Responsibility Model, DDOS Protection on AWS, AWS Shield, AWS WAF - Web Application Firewall, AWS KMS (Key Management Service), CloudHSM, AWS Certificate Manager (ACM), AWS Secrets Manager, AWS Artifact (not really a service), Amazon GuardDuty, Amazon Inspector, AWS Config, Amazon Macie, AWS Security Hub, Amazon Detective, AWS Abuse, Root user privileges
+  - AWS Shared Responsibility Model, DDOS Protection on AWS, AWS Shield, AWS WAF - Web Application Firewall, AWS KMS (Key Management Service), CloudHSM, AWS Certificate Manager (ACM), AWS Secrets Manager, AWS Artifact (not really a service), Amazon GuardDuty, Amazon Inspector, AWS Config, Amazon Macie, AWS Security Hub, Amazon Detective, AWS Abuse, Root user privileges, IAM Access Analyzer
 - [Machine Learning](sections/machine_learning.md)
   - Amazon Rekognition, Amazon Transcribe, Amazon Polly, Amazon Translate, Amazon Lex & Connect, Amazon Comprehend, Amazon SageMaker, Amazon Forecast, Amazon Kendra, Amazon Personalize, Amazon Textract
 - [Account Management, Billing & Support](sections/account_management_billing_support.md)

sections/security_compliance.md

@@ -28,6 +28,7 @@
   - [Amazon Detective](#amazon-detective)
   - [AWS Abuse](#aws-abuse)
   - [Root user privileges](#root-user-privileges)
+  - [IAM Access Analyzer](#iam-access-analyzer)
   - [Summary](#summary)
 
 ## AWS Shared Responsibility Model
@@ -312,6 +313,21 @@
   - Edit or delete an Amazon S3 bucket policy that includes an invalid VPC ID or VPC endpoint ID
   - Sign up for GovCloud
 
+## IAM Access Analyzer
+
+- AWS IAM Access Analyzer is a tool that scans your AWS resource policies to find any unintended public or cross-account access. It helps you identify and fix security issues, ensuring that only authorized entities have access to your resources.
+- Find out which resources are shared externally:
+  - S3 Buckets
+  - IAM Roles
+  - KMS Keys
+  - Lambda Functions and Layers
+  - SQS queues
+  - Secrets Manager Secrets
+- Define Zone of Trust = AWS Account or AWS Organization.
+- Access outside zone of trusts => findings
+
+<img src="../images/IAM_Access_Analyzer.png" height="350" width="300">
+
 ## Summary
 
 - Shared Responsibility on AWS