> ## Documentation Index > Fetch the complete documentation index at: https://notes.kodekloud.com/llms.txt > Use this file to discover all available pages before exploring further. # Section Overview Configure Access Control > Learn to secure your Vault deployment by defining access control strategies through identity management, policies, and multi-approval workflows. In this lesson, you’ll learn how to secure your Vault deployment by defining who can do what—and where. We’ll cover five fundamental topics to establish a robust access-control strategy: | Topic | Description | | ---------------------------------- | ---------------------------------------------------------------------------------------------------------- | | Vault Identity Entities and Groups | Structure user identities, group memberships, and attribute mappings for consistent access management. | | ACL Policies | Author, deploy, and debug fine-grained policies using Vault’s HCL-based policy language. | | Sentinel Policies | (Enterprise) Enforce or advise on customizable governance rules across your Vault infrastructure. | | Control Groups | (Enterprise) Require multi-approval workflows for sensitive operations by defining and configuring groups. | | Namespaces | (Enterprise) Implement multi-tenancy with isolated “Vaults within a Vault” for delegation and isolation. | Identity entities, groups, and ACL policies are available in both Vault Open Source and Enterprise editions.\ Sentinel policies, control groups, and namespaces require Vault Enterprise. With this roadmap in place, let’s dive into our first topic: interpreting Vault identity entities and groups.