What is IAM/SSO?Identity & Access Management / Single Sign-On explained

Think of the button employees click every morning that logs them into email, chat, and expense software with one username and password — instead of typing separate credentials into each one. That single login is backed by a system that also decides who is allowed into which app, what happens the moment someone joins or leaves, and whether a login attempt looks risky enough to demand extra proof of identity.

For most companies this system has become the front door for essentially everything else in the business — if it goes down, employees can't get into the tools they need, and if it's compromised, an attacker potentially has a path into everything connected to it.

The problem it solves

Without a central system like this, every application has its own username and password, so employees reuse passwords across services (a real risk) and IT has no single place to shut off access when someone leaves. A departing employee might still log into a dozen tools weeks after their last day, simply because nobody remembered to remove their account from each one.

It also creates an inconsistent front door: some apps allow logins from anywhere with just a password, while others require more. Centralizing authentication turns that patchwork into one enforced policy, and turns "who can log into what" into a question with one clear answer instead of a scavenger hunt across admin panels.

How it works

Employee and group information is synced in from wherever it already lives — often an HR system or existing directory — so the platform always has an up-to-date list of who should have access to what. When an employee logs in, they authenticate once against this central service using a supported second factor, then get handed off, without re-entering credentials, into each connected application through a standard handshake the app already trusts.

Access decisions aren't just a yes/no gate: the system weighs context like the device, its location, and how risky the request looks, and responds by requiring extra verification or blocking the attempt outright. Because provisioning ties back to the same source of truth used for logins, access can be granted automatically the day someone joins and revoked everywhere at once the day they leave, instead of relying on IT to remember.

Workforce identity vs customer identity

Everything above is about employees logging into internal work tools — commonly called workforce identity. A related but distinct discipline handles a completely different population: the end users signing into a company's own product or website. That customer-facing work has to scale to millions of accounts, support self-service signup and password reset, and sit inside a product's own login screens rather than an internal app catalog.

The underlying technology overlaps, but the two are usually bought and sold as separate products, since requirements — user volume, branding, self-service — diverge so much between a few hundred employees and an entire customer base.

Choosing one

For most organizations, the deciding factor is how many applications already in use show up as ready-made connectors — a large out-of-the-box app catalog means faster rollout and far less custom integration work. It's also worth checking how deeply the platform talks to whatever directory or HR system manages employee records, since that connection is what makes automatic provisioning and deprovisioning actually work.

Beyond that, look at how adaptive access and multi-factor enforcement are configured — whether risk-based policies tighten security for risky logins without adding friction to routine ones — since a poorly tuned policy either lets too much through or annoys employees into workarounds.