What Is Identity and Access Management (IAM)? How It Works, Components and Types

Identity and access management (IAM) is the set of policies, processes and software that decides who can access an organization’s systems and data, what they can do once inside, and when that access ends. It covers the full identity lifecycle: creating an identity, verifying it at sign-in (authentication), granting the right permissions (authorization), reviewing that access over time, and removing it when someone leaves.

Stolen and misused credentials are behind a large share of security incidents, and every new SaaS app adds another login to manage. IAM is how IT and security teams keep that under control. Think of a contractor who should reach one project folder but not payroll, or a leaver whose accounts in a dozen SaaS apps need to close the day they go: those boundaries do not enforce themselves.

This guide explains how IAM works, its core components and protocols, how IAM differs from IGA, PAM and CIAM, what IAM means in cloud platforms like AWS and Azure, and how to roll it out.

What Is Identity and Access Management?

IAM answers two questions for every request to use a resource:

• Authentication: who are you? The system verifies identity with something you know (password), something you have (phone, security key) or something you are (biometric).
• Authorization: what are you allowed to do? Once identity is confirmed, policy decides which applications, data and actions are permitted.

Most access failures are a gap in one of these two steps: someone gets in who should not (weak authentication), or they can reach more than they should once inside (weak authorization). IAM replaces spreadsheets, shared passwords and ad hoc IT tickets with a central system that applies the same rules everywhere and keeps a record.

“IAM” is used for both the discipline and the software. IAM software, also called IAM tools or an IAM platform, is the product that delivers these capabilities. For a comparison of products, see our guide to the best IAM tools.

How Does IAM Work?

A typical workforce IAM flow runs through five stages:

1. Identity is created. HR adds a new hire to the HR system. The IAM platform picks this up and creates a user in the directory with attributes such as department, role, manager and location.
2. Access is provisioned. Based on role and rules, the platform creates accounts in the apps the person needs (email, chat, CRM, code repository), usually through SCIM or app APIs, and assigns group memberships.
3. The user signs in. The user authenticates once to the identity provider with a password or passwordless method plus MFA. The identity provider checks policy (device, location, risk) and issues a signed token or assertion.
4. Applications trust the token. Through single sign-on protocols such as SAML or OpenID Connect, each app accepts the identity provider’s assertion and applies its own permissions based on the user’s groups or roles.
5. Access changes and ends. When the person changes role, access is adjusted; periodic access reviews confirm it is still needed; when they leave, disabling one identity removes access everywhere, and logs record every step.

Core Components of Identity and Access Management

Directory

The directory is the central store of identities and groups. Microsoft Active Directory remains common on-premises; cloud directories such as Microsoft Entra ID, Okta Universal Directory, JumpCloud and Google’s directory are standard for SaaS-first companies. Many organizations sync an on-premises directory to a cloud one.

Single sign-on (SSO)

SSO lets users authenticate once to an identity provider and open many applications without separate logins. It cuts password reuse and help-desk resets, and it gives IT one place to switch access off. For a deeper look at SAML, OIDC and OAuth, read what single sign-on is and how it works.

Multi-factor authentication (MFA)

MFA adds a second proof beyond the password: a push notification, a code from an authenticator app, a biometric or a hardware security key. Phishing-resistant methods such as FIDO2 security keys and passkeys are increasingly expected for administrators and high-risk users. Compare options in the best MFA software.

Access control models (RBAC and ABAC)

Role-based access control (RBAC) grants permissions by job role, so an HR manager role gets the HR system and a DevOps role gets cloud consoles. Attribute-based access control (ABAC) adds conditions such as department, location, device state or data sensitivity. Most organizations use RBAC as the backbone with attribute-based rules for exceptions.

Lifecycle management (provisioning and deprovisioning)

Automated joiner, mover and leaver processes create, change and remove accounts from HR events. This closes the orphaned-account gap, where former employees or contractors keep working credentials for weeks.

Identity governance

Governance adds access requests with approvals, periodic access reviews (certifications), separation-of-duties rules and audit reporting. It proves to auditors that access is appropriate. See the best identity governance software.

Privileged access management (PAM)

PAM protects the small set of accounts that can change systems: administrators, root and service accounts. It vaults credentials, grants just-in-time elevation and records privileged sessions. Read more in what privileged access management is.

Audit and monitoring

Every sign-in, change and approval is logged and usually streamed to a SIEM, so security teams can detect unusual access and investigate incidents.

IAM Protocols and Standards

IAM vs IGA vs PAM vs CIAM

IAM is the umbrella. The three specialist areas answer different questions:

IAM vs IGA: access management runs at the moment of login; governance runs continuously in the background and at review time. IAM vs PAM: PAM is the high-security subset for privileged accounts. IAM vs CIAM: workforce IAM serves thousands of employees with strict control; CIAM serves up to millions of customers with self-service sign-up and a smooth experience. See our guide to CIAM software and the full CIAM vs IAM comparison.

What Is IAM in AWS, Azure and Google Cloud?

In cloud platforms, “IAM” also names the built-in permission system for the platform’s own resources:

• AWS IAM controls who and what can call AWS APIs, using users, groups, roles and JSON policies. An IAM role is an identity with permissions that people, services or workloads assume temporarily, instead of using long-lived keys. Workforce sign-in to AWS accounts is usually handled by IAM Identity Center federated to your identity provider.
• Microsoft Azure uses Microsoft Entra ID for identities and Azure role-based access control (Azure RBAC) for permissions on Azure resources. That combination is the closest equivalent to AWS IAM.
• Google Cloud IAM grants roles to principals (users, groups, service accounts) on projects and resources.

Cloud IAM secures infrastructure. It sits alongside your workforce identity provider, which handles employee sign-in across all apps.

Benefits of Identity and Access Management

• Smaller attack surface: one strong sign-in with MFA replaces many reusable passwords, and a leaked password alone is not enough.
• Least privilege by default: roles and policies limit what a compromised account can reach.
• Faster onboarding and clean offboarding: new starters have access on day one; leavers lose it everywhere at once.
• Audit readiness: logs and access reviews map directly to SOC 2, ISO 27001, HIPAA, PCI DSS and SOX requirements.
• Zero trust foundation: zero trust verifies every request against identity, device and context, and IAM is the enforcement layer that makes those decisions.
• Lower support load: self-service password reset and access requests reduce help-desk tickets.

Common IAM Challenges

• App sprawl: apps outside SSO keep separate passwords and escape offboarding. Track the share of apps connected.
• Messy source data: if HR records are late or inaccurate, automation provisions the wrong access.
• Role explosion: too many narrowly defined roles become impossible to maintain.
• Non-human identities: service accounts, API keys and AI agents often lack owners and reviews.
• MFA fatigue: repeated push prompts train users to approve blindly; number matching and phishing-resistant methods help.

How to Implement IAM

1. Inventory identities (employees, contractors, service accounts) and applications, noting which support SSO and SCIM.
2. Consolidate authentication: put apps behind one identity provider with enforced MFA, starting with email, collaboration and admin consoles.
3. Automate the lifecycle: connect the HR system so joiners, movers and leavers flow automatically.
4. Govern: add access reviews and separation-of-duties checks once the data is trustworthy.
5. Protect privileged access with vaulting and just-in-time elevation.
6. Measure: time to provision a starter, time to fully revoke a leaver, percentage of apps behind SSO, and share of access reviewed last cycle.

For how an IAM program pays back operationally, read how an IAM strategy improves business processes. Compare products in the IAM software category on Spotsaas.

Frequently Asked Questions