Single Sign-On (SSO)

What is Single Sign-On (SSO)?

SSO lets you access multiple apps with one login. Before, Gmail login, Drive login, Sheets login, etc. With SSO, one Google login gives you access to all Google services.

In a nutshell: One theme park ticket gets you on all rides.

Key points:

• What it does: One login unifies access to multiple systems
• Why you need it: Reduce password management burden and improve security
• Who uses it: Enterprises using multiple SaaS tools or companies with many internal systems

Why it matters

Employees using 10+ systems must remember 10+ passwords. This leads to weak passwords, reuse, sticky notes—major security risks. SSO means one strong password for everything.

For companies, one change grants/revokes all system access. Onboarding and offboarding become easier. Help desk password reset requests drop dramatically, reducing IT costs.

How it works

Employee tries to access System A. SSO server (identity provider) checks: “Are you logged in?” If no, asks for password. If yes, gives a token saying “this employee is verified.”

System B request? Employee presents the token. Verified—access granted. No extra password needed. Token expires at logout or timeout.

Standards like SAML and OAuth 2.0 handle this securely.

Real-world use cases

Large IT company Dozens of tools unified. Morning login gives access to chat, email, documents, pay systems—all day.

SaaS for enterprises Slack, Notion, etc. provide SSO connecting to company’s own directory (Active Directory, Okta).

Universities Students/staff one login: learning management, library, email, grades.

Healthcare Doctors one login: medical records, tests, appointments. HIPAA compliance too.

Benefits and considerations

Benefits: One strong password. Simple password management. IT manages centrally. Help desk ticket volume drops.

Considerations: If SSO server goes down, you can’t access anything. Complex setup especially for older systems. Some third-party SaaS might not support it.

Related terms

• Authentication — SSO is authentication technology
• Identity Management — SSO’s key function
• Multi-Factor Authentication (MFA) — Combine with SSO for more security
• OAuth 2.0 — One SSO protocol standard
• Access Control — Unified permission management via SSO

Frequently asked questions

Q: How do we start SSO in our company? A: First, inventory current apps and check SSO compatibility. Then choose an SSO solution (Okta, Azure AD, etc.).

Q: Does SSO work in cloud? A: Yes, especially SaaS. Cloud-based SSO (Okta, Azure AD) is standard now.

Q: Does SSO really improve security? A: Yes. One strong password beats reused weak passwords across systems. Session management centralizes too.